doc: create document that explains defining translate-able content (#52)

.vscode/settings.json

@@ -7,6 +7,7 @@
     "buildFlags": ["-tags=tools"]
   },
   "cSpell.words": [
+    "astrolib",
     "avfs",
     "beezledub",
     "bodyclose",
@@ -68,6 +69,7 @@
     "shogo",
     "sidewalk",
     "snivilised",
+    "Sprintf",
     "staticcheck",
     "struct",
     "structcheck",

README.md

@@ -56,4 +56,4 @@ To maintain localisation of the application, the user must take care to implemen
 
 + define template struct (__xxxTemplData__) in __src/i18n/messages.go__ and corresponding __Message()__ method. All messages are defined here in the same location, simplifying the message extraction process as all extractable strings occur at the same place. Please see [go-i18n](https://github.com/nicksnyder/go-i18n) for all translation/pluralisation options and other regional sensitive content.
 
-For more detailed workflow instructions relating to i18n, please see [i18n README](./resources/doc/i18n-README.md)
+For more detailed workflow instructions relating to i18n, please see [i18n README](./resources/doc/i18n-README.md). For details on how defining translate-able content can be achieved consistently, see [Defining Content](./resources/doc/DEFINING-CONTENT.md)

messages.error.go

@@ -102,7 +102,7 @@ type PathNotFoundTemplData struct {
 func (td PathNotFoundTemplData) Message() *i18n.Message {
 	return &i18n.Message{
 		ID:          "path-not-found.error",
-		Description: "Directory or file path is does not exist",
+		Description: "Directory or file path does not exist",
 		Other:       "{{.Name}} path not found ({{.Path}})",
 	}
 }