diff --git a/contests/handlers/compare.py b/contests/handlers/compare.py
index c4a1ee2..8d2a5c4 100644
--- a/contests/handlers/compare.py
+++ b/contests/handlers/compare.py
@@ -80,7 +80,7 @@ def get_list_articles(self, contest):
             'gpllimit': 'max',
         }
         response = requests.get(contest.api_endpoint, params=list_api_params).json()
-        if not 'query' in response:
+        if 'query' not in response:
             return list_
 
         list_.extend(response['query']['pages'])
@@ -107,7 +107,7 @@ def get_category_articles(self, contest):
             "gcmlimit": "max",
         }
         response = requests.get(contest.api_endpoint, params=categorymembers_api_params).json()
-        if not 'query' in response:
+        if 'query' not in response:
             return list_
 
         list_.extend(response['query']['pages'])
@@ -132,7 +132,7 @@ def get_deletion_pages(self, contest):
             'cmprop': 'title',
         }
         response = requests.get(contest.api_endpoint, params=deletion_api_params).json()
-        if not 'query' in response:
+        if 'query' not in response:
             return list_
             
         list_.extend(response['query']['categorymembers'])
diff --git a/contests/handlers/contest.py b/contests/handlers/contest.py
index 7a15c15..db80732 100644
--- a/contests/handlers/contest.py
+++ b/contests/handlers/contest.py
@@ -108,7 +108,7 @@ def count_articles(self, contest):
             'format': 'json'
         }
         response = requests.get(contest.api_endpoint, params=api_params).json()
-        if not 'query' in response:
+        if 'query' not in response:
             return list_
 
         list_.extend(response['query']['pages'])
diff --git a/contests/handlers/evaluators.py b/contests/handlers/evaluators.py
index 5187bf0..bd4c321 100644
--- a/contests/handlers/evaluators.py
+++ b/contests/handlers/evaluators.py
@@ -10,13 +10,12 @@ def __init__(self, contest):
     def execute(self, request):
         evaluator = self.get_current_evaluator(request)
         
-        if request.method == 'POST':
-            if evaluator.user_status == 'G':
-                if request.POST.get('new'):
-                    self.add_new_evaluator(request.POST.get('new'))
+        if request.method == 'POST' and evaluator.user_status == 'G':
+            if request.POST.get('new'):
+                self.add_new_evaluator(request.POST.get('new'))
 
-                if request.POST.get('user'):
-                    self.update_evaluator_status(request)
+            if request.POST.get('user'):
+                self.update_evaluator_status(request)
 
         return {
             'contest': self.contest,
diff --git a/contests/handlers/graph.py b/contests/handlers/graph.py
index e9921e2..c4f79da 100644
--- a/contests/handlers/graph.py
+++ b/contests/handlers/graph.py
@@ -15,11 +15,11 @@ def __init__(self, contest):
         self.counter = CounterHandler(contest=self.contest)
         self.start_day = self.contest.start_time.strftime("%Y-%m-%d")
 
-    def execute(self, request):
+    def execute(self):
         if self.is_contest_not_started():
             return self._response_with_empty_graph()
 
-        end_day, finished = self.get_end_day_and_status()
+        end_day = self.get_end_day()
         days, last_day = self.prepare_days_range(end_day)
         all_points = self.collect_points_for_days(days + [last_day])
         best_users = self.get_top_users(all_points, last_day)
@@ -33,11 +33,11 @@ def execute(self, request):
     def is_contest_not_started(self):
         return now().date() < self.contest.start_time.date()
 
-    def get_end_day_and_status(self):
+    def get_end_day(self):
         if now().date() > self.contest.end_time.date():
             end_day = (self.contest.end_time + timedelta(days=1)).strftime("%Y-%m-%d")
-            return end_day, True
-        return now().strftime("%Y-%m-%d"), False
+            return end_day
+        return now().strftime("%Y-%m-%d")
 
     def prepare_days_range(self, end_day):
         days = self.generate_date_range(self.start_day, end_day)
diff --git a/contests/handlers/modify.py b/contests/handlers/modify.py
index ab39437..7a123ce 100644
--- a/contests/handlers/modify.py
+++ b/contests/handlers/modify.py
@@ -10,77 +10,85 @@ def __init__(self, contest):
         self.contest = contest
 
     def execute(self, request):
-        contest = self.contest
-        edit = None
-        diff = None
-        content = None
-        author = None
-        comment = None
-        evaluation = None
-        allowed = False
-        history_qualifications = None
-        history_evaluations = None
-
-        if Evaluator.objects.get(
-            contest=contest, 
-            profile=request.user.profile
-        ).user_status == 'G' or edit.last_evaluation.evaluator.profile == request.user.profile:
-            allowed = True        
-
         if request.method == 'POST' and request.POST.get('diff'):
             diff = request.POST.get('diff')
-            edit = Edit.objects.get(contest=contest, diff=diff)
+            edit = self.get_edit(diff)
+
+            if not edit:
+                return {'contest': self.contest, 'diff': diff, 'content': None}
+
+            allowed = self.is_allowed(request, edit)
+            content, author, comment = self.get_comparison_data(diff)
+            history_qualifications = self.get_history_qualifications(edit)
+            history_evaluations = self.get_history_evaluations(edit)
+
+            evaluation = None
+            if request.POST.get('obs'):
+                evaluation = self.create_evaluation(request, edit, allowed)
 
-            compare_params = {
-                'action': 'compare',
-                'prop': 'title|diff|comment|user|ids',
-                'format': 'json',
-                'fromrev': diff,
-                'torelative': 'prev',
+            return {
+                'contest': self.contest, 
+                'edit': edit, 
+                'diff': diff,
+                'evaluation': evaluation,
+                'allowed': allowed,
+                'content': content,
+                'author': author,
+                'comment': comment,
+                'history_qualifications': history_qualifications,
+                'history_evaluations': history_evaluations,
             }
-            compare = requests.get(contest.api_endpoint, params=compare_params).json().get('compare', {})
+        else:
+            return {'contest': self.contest, 'edit': None}
 
-            content = compare.get('*', '')
-            author = compare.get('touser', '')
-            comment = compare.get('tocomment', '')
+    def get_edit(self, diff):
+        try:
+            return Edit.objects.get(contest=self.contest, diff=diff)
+        except Edit.DoesNotExist:
+            return False
 
-            history_qualifications = Qualification.objects.filter(
-                contest=contest, 
-                diff=edit
-            ).select_related('evaluator__profile').order_by('-when')
+    def is_allowed(self, request, edit):
+        evaluator = Evaluator.objects.get(contest=self.contest, profile=request.user.profile)
+        return evaluator.user_status == 'G' or edit.last_evaluation.evaluator.profile == request.user.profile
 
-            history_evaluations = Evaluation.objects.filter(
-                contest=contest, 
-                diff=edit
-            ).select_related('evaluator__profile').order_by('-when')
-            
-            if request.POST.get('obs'):
-                if allowed:
-                    evaluation = Evaluation.objects.create(
-                        contest=contest,
-                        evaluator=Evaluator.objects.get(contest=contest, profile=request.user.profile),
-                        diff=edit,
-                        valid_edit=True if request.POST.get('valid') == '1' else False,
-                        pictures=request.POST.get('pic') if request.POST.get('pic').isnumeric() else 0,
-                        real_bytes=request.POST.get('overwrite') or Edit.objects.get(contest=contest, diff=diff).orig_bytes,
-                        status=1,
-                        obs=request.POST.get('obs'),
-                    )
-                    edit.last_evaluation = evaluation
-                    edit.save()
-                else:
-                    raise PermissionDenied("You are not allowed to perform this action.")
-        
-        return_dict = {
-            'contest': contest, 
-            'edit': edit, 
-            'diff': diff,
-            'evaluation': evaluation,
-            'allowed': allowed,
-            'content': content,
-            'author': author,
-            'comment': comment,
-            'history_qualifications': history_qualifications,
-            'history_evaluations': history_evaluations,
+    def get_comparison_data(self, diff):
+        compare_params = {
+            'action': 'compare',
+            'prop': 'title|diff|comment|user|ids',
+            'format': 'json',
+            'fromrev': diff,
+            'torelative': 'prev',
         }
-        return return_dict
\ No newline at end of file
+        compare = requests.get(self.contest.api_endpoint, params=compare_params).json().get('compare', {})
+        return compare.get('*', ''), compare.get('touser', ''), compare.get('tocomment', '')
+
+    def get_history_qualifications(self, edit):
+        return Qualification.objects.filter(
+            contest=self.contest, 
+            diff=edit
+        ).select_related('evaluator__profile').order_by('-when')
+
+    def get_history_evaluations(self, edit):
+        return Evaluation.objects.filter(
+            contest=self.contest, 
+            diff=edit
+        ).select_related('evaluator__profile').order_by('-when')
+
+    def create_evaluation(self, request, edit, allowed):
+        if allowed:
+            evaluation = Evaluation.objects.create(
+                contest=self.contest,
+                evaluator=Evaluator.objects.get(contest=self.contest, profile=request.user.profile),
+                diff=edit,
+                valid_edit=True if request.POST.get('valid') == '1' else False,
+                pictures=request.POST.get('pic') if request.POST.get('pic').isnumeric() else 0,
+                real_bytes=request.POST.get('overwrite') or edit.orig_bytes,
+                status=1,
+                obs=request.POST.get('obs'),
+            )
+            edit.last_evaluation = evaluation
+            edit.save()
+            return True
+        else:
+            raise PermissionDenied("You are not allowed to perform this action.")
+        
\ No newline at end of file
diff --git a/contests/handlers/triage.py b/contests/handlers/triage.py
index a5fab96..8c19703 100644
--- a/contests/handlers/triage.py
+++ b/contests/handlers/triage.py
@@ -185,7 +185,7 @@ def unhold_edit(self):
         )
 
         for locked in lockeds:
-            evalution = Evaluation.objects.create(
+            evaluation = Evaluation.objects.create(
                 contest=self.contest,
                 diff=locked.diff,
                 status='0' # Status '0' indicates the edit is pending
@@ -298,7 +298,14 @@ def build_context(self, revision_history, current_diff):
                 delta = edit['size'] - revision_history[i + 1]['size']
             else:
                 delta = edit['size']
-            delta_color = 'green' if delta > 0 else ('red' if delta < 0 else 'grey')
+
+            if delta > 0:
+                delta_color = 'green'
+            elif delta < 0:
+                delta_color = 'red'
+            else:
+                delta_color = 'grey'
+                
             history_class = 'w3-small w3-leftbar w3-border-grey w3-padding-small' if edit['revid'] == current_diff else 'w3-small'
             
             if edit['revid'] != 0:
diff --git a/contests/management/commands/load_edits.py b/contests/management/commands/load_edits.py
index f0ea749..421f6ee 100644
--- a/contests/management/commands/load_edits.py
+++ b/contests/management/commands/load_edits.py
@@ -94,7 +94,7 @@ def get_category_articles(self, contest):
             "cmlimit": "max"
         }
         response = requests.get(contest.api_endpoint, params=categorymembers_api_params).json()
-        if not 'query' in response:
+        if 'query' not in response:
             return list_
             
         list_.extend(response['query']['categorymembers'])
diff --git a/contests/models.py b/contests/models.py
index 2fcde0f..57d66e5 100644
--- a/contests/models.py
+++ b/contests/models.py
@@ -135,8 +135,6 @@ class Evaluation(models.Model):
     when = models.DateTimeField(auto_now_add=True)
     obs = models.TextField(blank=True, null=True)
 
-    def __str__(self):
-        return (f"{self.contest.name_id} - {self.diff.diff} - {self.evaluator.profile.username} - {self.status} - {self.when}")
-        
+    def __str__(self):        
         name = self.evaluator.profile.username if self.evaluator else 'None'
         return (f"{self.contest.name_id} - {self.diff.diff} - {name} - {self.status} - {self.when}")
\ No newline at end of file
diff --git a/contests/templates/contest.html b/contests/templates/contest.html
index bf41888..8789dcc 100644
--- a/contests/templates/contest.html
+++ b/contests/templates/contest.html
@@ -18,7 +18,10 @@
         </style>
     {% endif %}
     <link rel="stylesheet" href="https://tools-static.wmflabs.org/cdnjs/ajax/libs/font-awesome/6.2.0/css/all.css">
-    <script src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/Chart.js/3.9.1/chart.min.js"></script>
+    <script 
+        src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/Chart.js/3.9.1/chart.min.js" 
+        integrity="sha384-9MhbyIRcBVQiiC7FSd7T38oJNj2Zh+EfxS7/vjhBi4OOT78NlHSnzM31EZRWR1LZ" 
+        crossorigin="anonymous"></script>
 </head>
 <body>
     <div class="w3-{{ contest.theme }} w3-large w3-bar">
diff --git a/contests/templates/edits.html b/contests/templates/edits.html
index 878153d..d11b355 100644
--- a/contests/templates/edits.html
+++ b/contests/templates/edits.html
@@ -11,11 +11,26 @@
     <link rel="stylesheet" href="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables/1.10.21/css/jquery.dataTables.min.css" />
     <link rel="stylesheet" href="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-buttons-dt/2.3.6/buttons.dataTables.min.css" />
     <link rel="stylesheet" href="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-responsive-dt/2.4.1/responsive.dataTables.min.css" />
-    <script src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/jquery/3.7.0/jquery.min.js"></script>
-    <script src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net/2.1.1/jquery.dataTables.min.js"></script>
-    <script src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-responsive/2.4.1/dataTables.responsive.min.js"></script>
-    <script src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-buttons/2.3.6/js/dataTables.buttons.min.js"></script>
-    <script src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-buttons/2.3.6/js/buttons.colVis.min.js"></script>
+    <script 
+        src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/jquery/3.7.0/jquery.min.js" 
+        integrity="sha384-NXgwF8Kv9SSAr+jemKKcbvQsz+teULH/a5UNJvZc6kP47hZgl62M1vGnw6gHQhb1" 
+        crossorigin="anonymous"></script>
+    <script 
+        src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net/2.1.1/jquery.dataTables.min.js" 
+        integrity="sha384-FL5V3MGBdvjK1/lXuDlPXHHDAjM6lXTKHQH1rBXPSF63sIN2p6/49GfrqXI9N/t7" 
+        crossorigin="anonymous"></script>
+    <script 
+        src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-responsive/2.4.1/dataTables.responsive.min.js" 
+        integrity="sha384-iQC83CKNYyann9W2gqpKB/p3aitJrLa4MIcxGclC61mNprEqXuheYiCE7JSJnRO9" 
+        crossorigin="anonymous"></script>
+    <script 
+        src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-buttons/2.3.6/js/dataTables.buttons.min.js" 
+        integrity="sha384-jbU1hH+4p38WsOp+7JWEb6ztIpXa7u9npGVDNGEj4w9AUujc3X2E4aTDZ+xo1PgU" 
+        crossorigin="anonymous"></script>
+    <script 
+        src="https://tools-static.wmflabs.org/cdnjs/ajax/libs/datatables.net-buttons/2.3.6/js/buttons.colVis.min.js" 
+        integrity="sha384-h/SRPFzc2+BE+XfOqlAqiHb43fnY8jzXhQ0fI1JBfgrjbxUokMr9To2eLbSWEt1g" 
+        crossorigin="anonymous"></script>
     <style>
     .loader {
         border: 16px solid #f3f3f3;
diff --git a/contests/templates/modify.html b/contests/templates/modify.html
index 2edd439..362928e 100644
--- a/contests/templates/modify.html
+++ b/contests/templates/modify.html
@@ -20,6 +20,9 @@
         document.getElementById('obs').required = true;
     }
 </script>
+{% if evaluation %}
+    <script>alert('{% trans 'Modification successfully done!' context 'modify-success' %}');</script>
+{% endif %}
 {% endblock %}
 
 {% block content %}
@@ -32,11 +35,11 @@ <h2>{% trans 'Check evaluation' context 'modify-consult' %}</h2>
                     <input
                     class="w3-input w3-border"
                     type="number"
-                    name="diff"
+                    id="diff-input" name="diff"
                     value="{{ diff }}"
                     required
                     >
-                    <label>{% trans 'Diff' context 'modify-diff' %}</label>
+                    <label for="diff-input">{% trans 'Diff' context 'modify-diff' %}</label>
                 </p>
                 <p>
                     <button
@@ -45,189 +48,184 @@ <h2>{% trans 'Check evaluation' context 'modify-consult' %}</h2>
                     >{% trans 'Load edit' context 'modify-load' %}</button>
                 </p>
             </form>
-            <form
-            class="w3-container w3-light-grey w3-border w3-border-dark-grey w3-margin-bottom"
-            id="modify"
-            method="post"
-            style="display:{% if allowed %}block{% else %}none{% endif %}"
-            >
-                <h2>{% trans 'Reevaluate' context 'modify-reavaluate' %}</h2>
-                {% csrf_token %}
-                <input type="hidden" name="diff" value="{{ diff }}">
-                <div class="w3-container w3-cell w3-half">
-                    <p>{% trans 'Valid edit?' context 'isvalid' %}</p>
-                    <input
-                    class="w3-radio w3-section"
-                    type="radio"
-                    id="valid-sim"
-                    name="valid"
-                    value="1"
-                    onclick="document.getElementById('obs').required = false"
-                    onKeyDown="document.getElementById('obs').required = false"
-                    required>
-                    <label for="valid-sim">{% trans 'Yes' context 'yes' %}</label><br>
-                    <input
-                    class="w3-radio w3-section"
-                    type="radio"
-                    id="valid-nao"
-                    name="valid"
-                    value="0"
-                    onclick="document.getElementById('obs').required = true"
-                    onKeyDown="document.getElementById('obs').required = true" 
-                    required>
-                    <label for="valid-nao">{% trans 'No' context 'no' %}</label><br><br>
-                </div>
-                <div class="w3-container w3-cell w3-half">
-                    <p>{% trans 'With image?' context 'withimage' %}</p>
-                    {% if contest.pictures_mode == 2 %}
-                        <input
-                        class="w3-input w3-border"
-                        type="number"
-                        id="pic"
-                        name="pic"
-                        value="0"
-                        min="0"
-                        max="9"
-                        required>
-                        <label for="pic">{% trans 'Quantity' context 'quantity' %}</label><br><br>
-                    {% else %}
+            {% if edit %}
+                <form
+                class="w3-container w3-light-grey w3-border w3-border-dark-grey w3-margin-bottom"
+                id="modify"
+                method="post"
+                style="display:{% if allowed %}block{% else %}none{% endif %}"
+                >
+                    <h2>{% trans 'Reevaluate' context 'modify-reavaluate' %}</h2>
+                    {% csrf_token %}
+                    <input type="hidden" name="diff" value="{{ diff }}">
+                    <div class="w3-container w3-cell w3-half">
+                        <p>{% trans 'Valid edit?' context 'isvalid' %}</p>
                         <input
                         class="w3-radio w3-section"
                         type="radio"
-                        id="pic-sim"
-                        name="pic"
+                        id="valid-sim"
+                        name="valid"
                         value="1"
                         required>
-                        <label for="pic-sim">{% trans 'Yes' context 'yes' %}</label><br>
+                        <label for="valid-sim">{% trans 'Yes' context 'yes' %}</label><br>
                         <input
                         class="w3-radio w3-section"
                         type="radio"
-                        id="pic-nao"
-                        name="pic"
+                        id="valid-nao"
+                        name="valid"
                         value="0"
                         required>
-                        <label for="pic-nao">{% trans 'No' context 'no' %}</label><br><br>
-                    {% endif %}
-                </div>
-                <p>
-                    <input
-                    class="w3-input w3-border"
-                    name="obs"
-                    id="obs"
-                    type="text"
-                    placeholder="Observação"
-                    required
-                    >
-                    <br>
-                    <input
-                    class="w3-button w3-border w3-block w3-red"
-                    name="overwrite"
-                    id="overwrite"
-                    type="button"
-                    value="Alterar bytes"
-                    onclick="changeInput()"
-                    onKeyDown="changeInput()">
-                    <input
-                    class="w3-button w3-orange w3-border-orange w3-border w3-block w3-margin-top"
-                    type="submit"
-                    value="{% trans 'Review' context 'modify' %}"
-                    >
-                </p>
-            </form>
-            <div
-            class="w3-container w3-light-grey w3-border w3-border-dark-grey w3-margin-bottom"
-            style="display: {% if diff %}block{% else %}none{% endif %}"
-            >   
-                {% if content %}
-                <h2>{% trans 'Data from edit' context 'modify-diffstats' %}</h2>
-                <ul class="w3-ul w3-margin-bottom">
-                    <li>{% trans 'Edit:' context 'modify-label-edition' %}<br>
-                        <a
-                        href="{{ contest.endpoint }}?diff={{ diff }}"
-                        target="_blank"
-                        rel="noopener"
+                        <label for="valid-nao">{% trans 'No' context 'no' %}</label><br><br>
+                    </div>
+                    <div class="w3-container w3-cell w3-half">
+                        <p>{% trans 'With image?' context 'withimage' %}</p>
+                        {% if contest.pictures_mode == 2 %}
+                            <input
+                            class="w3-input w3-border"
+                            type="number"
+                            id="pic"
+                            name="pic"
+                            value="0"
+                            min="0"
+                            max="9"
+                            required>
+                            <label for="pic">{% trans 'Quantity' context 'quantity' %}</label><br><br>
+                        {% else %}
+                            <input
+                            class="w3-radio w3-section"
+                            type="radio"
+                            id="pic-sim"
+                            name="pic"
+                            value="1"
+                            required>
+                            <label for="pic-sim">{% trans 'Yes' context 'yes' %}</label><br>
+                            <input
+                            class="w3-radio w3-section"
+                            type="radio"
+                            id="pic-nao"
+                            name="pic"
+                            value="0"
+                            required>
+                            <label for="pic-nao">{% trans 'No' context 'no' %}</label><br><br>
+                        {% endif %}
+                    </div>
+                    <p>
+                        <input
+                        class="w3-input w3-border"
+                        name="obs"
+                        id="obs"
+                        type="text"
+                        placeholder="Observação"
+                        required
                         >
-                            {{ diff }}
-                        </a>
-                    </li>
-                    <li>{% trans 'Article ID:' context 'modify-label-curid' %}<br>
-                        <a
-                        href="{{ contest.endpoint }}?curid={{ edit.article.articleID }}"
-                        target="_blank"
-                        rel="noopener"
+                        <br>
+                        <input
+                        class="w3-button w3-border w3-block w3-red"
+                        name="overwrite"
+                        id="overwrite"
+                        type="button"
+                        value="Alterar bytes"
+                        onclick="changeInput()"
+                        onKeyDown="changeInput()">
+                        <input
+                        class="w3-button w3-orange w3-border-orange w3-border w3-block w3-margin-top"
+                        type="submit"
+                        value="{% trans 'Review' context 'modify' %}"
                         >
-                            {{ edit.article.articleID }}
-                        </a>
-                    </li>
-                    <li>{% trans 'Timestamp:' context 'label-timestamp' %}<br>{{ edit.timestamp }}</li>
-                    <li>{% trans 'User:' context 'label-user' %}<br>{{ author }}</li>
-                    <li>{% trans 'Bytes:' context 'modify-label-bytes' %}<br>{{ edit.orig_bytes }} -> {{ edit.last_evaluation.real_bytes }}</li>
-                    <li>{% trans 'Summary:' context 'label-summary' %}<br>{{ comment }}</li>
-                    <li>{% trans 'New article:' context 'modify-label-newpage' %}<br>{% if edit.new_page %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
-                    <li>{% trans 'Valid edit:' context 'modify-label-valid' %}<br>{% if edit.last_evaluation.valid_edit %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
-                    <li>{% trans 'Enrolled user:' context 'modify-label-enrolled' %}<br>{% if edit.participant.last_enrollment.enrolled %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
-                    <li>{% trans 'With image:' context 'modify-label-withimage' %}<br>{{ edit.last_evaluation.pictures }}</li>
-                    <li>{% trans 'Reverted edit:' context 'modify-label-reverted' %}<br>{% if edit.last_qualification.status == 0 %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
-                    <li>{% trans 'Evaluator:' context 'modify-label-evaluator' %}<br>{{ edit.last_evaluation.evaluator.profile.username }}</li>
-                    <li>{% trans 'Evaluation timestamp:' context 'modify-label-evaltimestamp' %}<br>{{ edit.last_evaluation.when }}</li>
-                    <li>{% trans "Evaluator's comment:" context 'modify-label-comment' %}<br>{{ edit.last_evaluation.obs|default_if_none:"" }}&nbsp;</li>
-                </ul>
-                {% endif %}
-            </div>
+                    </p>
+                </form>
+                <div
+                class="w3-container w3-light-grey w3-border w3-border-dark-grey w3-margin-bottom"
+                style="display: {% if diff %}block{% else %}none{% endif %}"
+                >   
+                    {% if content %}
+                    <h2>{% trans 'Data from edit' context 'modify-diffstats' %}</h2>
+                    <ul class="w3-ul w3-margin-bottom">
+                        <li>{% trans 'Edit:' context 'modify-label-edition' %}<br>
+                            <a
+                            href="{{ contest.endpoint }}?diff={{ diff }}"
+                            target="_blank"
+                            rel="noopener"
+                            >
+                                {{ diff }}
+                            </a>
+                        </li>
+                        <li>{% trans 'Article ID:' context 'modify-label-curid' %}<br>
+                            <a
+                            href="{{ contest.endpoint }}?curid={{ edit.article.articleID }}"
+                            target="_blank"
+                            rel="noopener"
+                            >
+                                {{ edit.article.articleID }}
+                            </a>
+                        </li>
+                        <li>{% trans 'Timestamp:' context 'label-timestamp' %}<br>{{ edit.timestamp }}</li>
+                        <li>{% trans 'User:' context 'label-user' %}<br>{{ author }}</li>
+                        <li>{% trans 'Bytes:' context 'modify-label-bytes' %}<br>{{ edit.orig_bytes }} -> {{ edit.last_evaluation.real_bytes }}</li>
+                        <li>{% trans 'Summary:' context 'label-summary' %}<br>{{ comment }}</li>
+                        <li>{% trans 'New article:' context 'modify-label-newpage' %}<br>{% if edit.new_page %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
+                        <li>{% trans 'Valid edit:' context 'modify-label-valid' %}<br>{% if edit.last_evaluation.valid_edit %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
+                        <li>{% trans 'Enrolled user:' context 'modify-label-enrolled' %}<br>{% if edit.participant.last_enrollment.enrolled %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
+                        <li>{% trans 'With image:' context 'modify-label-withimage' %}<br>{{ edit.last_evaluation.pictures }}</li>
+                        <li>{% trans 'Reverted edit:' context 'modify-label-reverted' %}<br>{% if edit.last_qualification.status == 0 %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</li>
+                        <li>{% trans 'Evaluator:' context 'modify-label-evaluator' %}<br>{{ edit.last_evaluation.evaluator.profile.username }}</li>
+                        <li>{% trans 'Evaluation timestamp:' context 'modify-label-evaltimestamp' %}<br>{{ edit.last_evaluation.when }}</li>
+                        <li>{% trans "Evaluator's comment:" context 'modify-label-comment' %}<br>{{ edit.last_evaluation.obs|default_if_none:"" }}&nbsp;</li>
+                    </ul>
+                    {% endif %}
+                </div>
+            {% endif %}
         </div>
         <div class="w3-threequarter">
             {% if content %}
-            <div>
-                <h3>{% trans 'Edit diff' context 'modify-showdiff' %}</h3>
-                <table
-                role="presentation"
-                aria-label="{% trans 'Edit diff' context 'modify-showdiff' %}"
-                class="diff diff-contentalign-left diff-editfont-monospace"
-                >
-                    {{ content | safe }}
-                </table>
-                <hr>
-                <table class="w3-table-all w3-section">
-                    <tr>
-                        <th>{% trans 'Qualified?' context 'modify-qualified' %}</th>
-                        <th>{% trans 'Evaluator' context 'edits-evaluator' %}</th>
-                        <th>{% trans 'Timestamp' context 'modify-timestamp' %}</th>
-                    </tr>
-                    {% for qualification in history_qualifications %}
+                <div>
+                    <h3>{% trans 'Edit diff' context 'modify-showdiff' %}</h3>
+                    <table
+                    role="presentation"
+                    aria-label="{% trans 'Edit diff' context 'modify-showdiff' %}"
+                    class="diff diff-contentalign-left diff-editfont-monospace"
+                    >
+                        {{ content | safe }}
+                    </table>
+                    <hr>
+                    <table class="w3-table-all w3-section">
                         <tr>
-                            <td>{% if qualification.status == 1 %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</td>
-                            <td>{% if qualification.evaluator is None %}<i>{% trans 'Automatic' context 'modify-automatic' %}</i>{% else %}{{ qualification.evaluator.profile.username }}{% endif %}</td>
-                            <td>{{ qualification.when }}</td>
+                            <th>{% trans 'Qualified?' context 'modify-qualified' %}</th>
+                            <th>{% trans 'Evaluator' context 'edits-evaluator' %}</th>
+                            <th>{% trans 'Timestamp' context 'modify-timestamp' %}</th>
                         </tr>
-                    {% endfor %}
-                </table>
-                <table class="w3-table-all w3-section">
-                    <tr>
-                        <th>{% trans 'Valid edit?' context 'isvalid' %}</th>
-                        <th>{% trans 'With image?' context 'withimage' %}</th>
-                        <th>{% trans 'Bytes' context 'edits-bytes' %}</th>
-                        <th>{% trans 'Observation' context 'triage-observation' %}</th>
-                        <th>{% trans 'Evaluator' context 'edits-evaluator' %}</th>
-                        <th>{% trans 'Timestamp' context 'modify-timestamp' %}</th>
-                    </tr>
-                    {% for eval in history_evaluations %}
+                        {% for qualification in history_qualifications %}
+                            <tr>
+                                <td>{% if qualification.status == 1 %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</td>
+                                <td>{% if qualification.evaluator is None %}<i>{% trans 'Automatic' context 'modify-automatic' %}</i>{% else %}{{ qualification.evaluator.profile.username }}{% endif %}</td>
+                                <td>{{ qualification.when }}</td>
+                            </tr>
+                        {% endfor %}
+                    </table>
+                    <table class="w3-table-all w3-section">
                         <tr>
-                            <td>{% if eval.valid_edit %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</td>
-                            <td>{{ eval.pictures }}</td>
-                            <td>{{ eval.real_bytes }}</td>
-                            <td>{{ eval.obs|default_if_none:"" }}</td>
-                            <td>{{ eval.evaluator.profile.username }}</td>
-                            <td>{{ eval.when }}</td>
+                            <th>{% trans 'Valid edit?' context 'isvalid' %}</th>
+                            <th>{% trans 'With image?' context 'withimage' %}</th>
+                            <th>{% trans 'Bytes' context 'edits-bytes' %}</th>
+                            <th>{% trans 'Observation' context 'triage-observation' %}</th>
+                            <th>{% trans 'Evaluator' context 'edits-evaluator' %}</th>
+                            <th>{% trans 'Timestamp' context 'modify-timestamp' %}</th>
                         </tr>
-                    {% endfor %}
-                </table>
-            </div>
+                        {% for eval in history_evaluations %}
+                            <tr>
+                                <td>{% if eval.valid_edit %}{% trans 'Yes' context 'yes' %}{% else %}{% trans 'No' context 'no' %}{% endif %}</td>
+                                <td>{{ eval.pictures }}</td>
+                                <td>{{ eval.real_bytes }}</td>
+                                <td>{{ eval.obs|default_if_none:"" }}</td>
+                                <td>{{ eval.evaluator.profile.username }}</td>
+                                <td>{{ eval.when }}</td>
+                            </tr>
+                        {% endfor %}
+                    </table>
+                </div>
             {% elif diff and not content %}
                 <script>alert('{% trans 'Edit not found in the database!' context 'modify-notfound' %}');</script>
             {% endif %}
-            {% if evalution %}
-                <script>alert('{% trans 'Modification successfully done!' context 'modify-success' %}');</script>
-            {% endif %}
         </div>
     </div>
 {% endblock %}
\ No newline at end of file
diff --git a/contests/views.py b/contests/views.py
index 95f90ce..b07cc03 100644
--- a/contests/views.py
+++ b/contests/views.py
@@ -5,6 +5,7 @@
 from django.core.exceptions import PermissionDenied, BadRequest
 from django.contrib.auth.decorators import login_required
 from django.shortcuts import render, redirect, get_object_or_404
+from django.views.decorators.http import require_GET, require_http_methods
 from functools import wraps
 from collections import defaultdict
 from pathlib import Path
@@ -67,14 +68,27 @@ def get_active_commit_hash():
     with head_dir.open("r") as f: content = f.read().splitlines()
     return content[0][:7]
 
+@require_GET
 def redirect_view(request):
     lang = request.GET.get('lang')
     contest = request.GET.get('contest')
     page = request.GET.get('page')
 
+    page_list = [
+        'contest', 
+        'triage', 
+        'counter', 
+        'backtrack', 
+        'compare', 
+        'edits', 
+        'evaluators', 
+        'modify',
+        'graph',
+    ]
+
     if contest and not page:
         response = redirect(f"/contests/?contest={contest}")
-    elif contest and page:
+    elif contest and page in page_list:
         response = redirect(f"/{page}/?contest={contest}")
     else:
         response = redirect('/')
@@ -85,6 +99,7 @@ def redirect_view(request):
 
     return response
 
+@require_GET
 def home_view(request):
     contests = Contest.objects.select_related('group').order_by('-start_time')
     
@@ -103,6 +118,7 @@ def home_view(request):
         'git_commit': 'Commit: ' + get_active_commit_hash() + ' - ' + get_active_commit_message(),
     })
 
+@require_GET
 def contest_view(request):
     contest = get_contest_from_request(request)
     if not contest:
@@ -110,15 +126,17 @@ def contest_view(request):
     handler = ContestHandler(contest=contest)
     return render_with_bidi(request, 'contest.html', handler.execute(request))
 
+@require_GET
 def graph_view(request):
     contest = get_contest_from_request(request)
     if not contest:
         return redirect('/')
     handler = GraphHandler(contest=contest)
-    return render_with_bidi(request, 'graph.html', handler.execute(request))
+    return render_with_bidi(request, 'graph.html', handler.execute())
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def triage_view(request, contest):
     handler = TriageHandler(contest=contest, user=request.user, api_endpoint=contest.api_endpoint)
     if request.method == 'POST':
@@ -136,15 +154,15 @@ def triage_view(request, contest):
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def counter_view(request, contest):
     handler = CounterHandler(contest=contest)
     return render_with_bidi(request, "counter.html", handler.get_context(request))
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def backtrack_view(request, contest):
-    contest = get_object_or_404(Contest, name_id=request.GET.get('contest'))
-
     qualified = False
     diff = None
     if request.POST.get('diff'):
@@ -173,12 +191,14 @@ def backtrack_view(request, contest):
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def compare_view(request, contest):
     handler = CompareHandler(contest=contest)
     return render_with_bidi(request, 'compare.html', handler.execute(request))
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def edits_view(request, contest):
     edits = Edit.objects.filter(contest=contest).select_related(
         'article', 'participant', 'last_evaluation__evaluator__profile', 'last_qualification'
@@ -194,17 +214,20 @@ def edits_view(request, contest):
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def evaluators_view(request, contest):
     handler = EvaluatorsHandler(contest=contest)
     return render_with_bidi(request, 'evaluators.html', handler.execute(request))
 
 @login_required()
 @contest_evaluator_required
+@require_http_methods(["GET", "POST"])
 def modify_view(request, contest):
     handler = ModifyHandler(contest=contest)
     return render_with_bidi(request, 'modify.html', handler.execute(request))
 
 @login_required()
+@require_http_methods(["GET", "POST"])
 def manage_view(request):
     if request.user.profile.group_set.exists():
         handler = ManageHandler()
diff --git a/credentials/pipeline.py b/credentials/pipeline.py
index 4513a42..cdaa023 100644
--- a/credentials/pipeline.py
+++ b/credentials/pipeline.py
@@ -60,7 +60,7 @@ def save_profile(backend, user, response, *args, **kwargs):
                     user.username = new_username
                     user.save()
 
-                profile, created = Profile.objects.get_or_create(global_id=global_id)
+                profile, _ = Profile.objects.get_or_create(global_id=global_id)
                 if profile.account != user:
                     profile.account = user
                     profile.save()
diff --git a/credentials/views.py b/credentials/views.py
index 15a4469..35a73de 100644
--- a/credentials/views.py
+++ b/credentials/views.py
@@ -8,7 +8,7 @@ def triage_view(request):
     context = {}
     return render(request, "triage.html", context)
 
-def login_oauth(request):
+def login_oauth():
     return redirect(reverse('social:begin', kwargs={"backend": "mediawiki"}))
 
 def logout(request):