Clarify that only Aegis vaults can be imported during the intro

Some users understandably get confused when they try to import a backup
file from a different 2FA app during the intro and then get greeted
with an error dialog.

This changes the button text to "Import Aegis vault" and adds a small
hint text in the hope that this makes the limitations of the intro more
clear to the user.

<img width="200" src="https://alexbakker.me/u/jzhh3bk30w.png" />

app/src/main/res/layout/fragment_welcome_slide.xml

@@ -18,37 +18,52 @@
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toTopOf="parent" />
 
+    <TextView
+        android:id="@+id/descriptionText"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/app_description"
+        android:textAlignment="center"
+        android:textSize="16sp"
+        android:layout_marginTop="10dp"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintTop_toBottomOf="@+id/titleText" />
+
     <ImageView
+        android:id="@+id/imgLogo"
         android:layout_width="210dp"
         android:layout_height="210dp"
         android:layout_marginTop="60dp"
         android:adjustViewBounds="true"
         android:src="@drawable/app_icon"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintTop_toBottomOf="@+id/titleText"/>
+        app:layout_constraintTop_toBottomOf="@+id/descriptionText"/>
 
     <Button
         android:id="@+id/btnImport"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:layout_marginBottom="32dp"
+        android:layout_marginBottom="5dp"
         android:text="@string/import_vault"
         android:textSize="11sp"
+        android:layout_marginVertical="10dp"
         style="?attr/outlineButtonStyle"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintBottom_toTopOf="@+id/descriptionText" />
+        app:layout_constraintBottom_toTopOf="@+id/txtImportHelp" />
 
     <TextView
-        android:id="@+id/descriptionText"
-        android:layout_width="match_parent"
+        android:id="@+id/txtImportHelp"
+        android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:text="@string/app_description"
+        android:text="@string/import_vault_hint"
+        android:textSize="11sp"
         android:textAlignment="center"
-        android:textSize="16sp"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent" />
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintWidth_percent="0.9" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values/strings.xml

@@ -469,7 +469,8 @@
     <string name="pref_panic_trigger_title">Delete vault on panic trigger</string>
     <string name="pref_panic_trigger_summary">Delete vault when a panic trigger is received from Ripple</string>
 
-    <string name="import_vault">Import vault</string>
+    <string name="import_vault">Import Aegis vault</string>
+    <string name="import_vault_hint">Want to import from a different 2FA app? Complete the setup first and then head over to the settings menu.</string>
     <plurals name="import_duplicate_toast">
         <item quantity="one">Unchecked %d potential duplicate. Please review the list of entries.</item>
         <item quantity="other">Unchecked %d potential duplicates. Please review the list of entries.</item>