Allow different prompt message when prompting to publish file. b=149741, r=brade, sr=alecf

editor/ui/composer/content/editor.js

@@ -579,7 +579,7 @@ function CheckAndSaveDocument(command, allowDontSave)
     title = GetString("untitled");
 
   var dialogTitle = GetString(doPublish ? "PublishPage" : "SaveDocument");
-  var dialogMsg = GetString("SaveFilePrompt");
+  var dialogMsg = GetString(doPublish ? "PublishPrompt" : "SaveFilePrompt");
   dialogMsg = (dialogMsg.replace(/%title%/,title)).replace(/%reason%/,reasonToSave);
 
   var promptService = GetPromptService();

editor/ui/composer/locale/en-US/editor.properties

@@ -51,8 +51,9 @@ AllFiles=All Files
 BeforeClosing=before closing
 BeforePreview=before viewing in Navigator
 BeforeValidate=before validating the document
-# LOCALIZATION NOTE (SaveFilePrompt): Don't translate %title% and %reason% (this is the reason for asking user to close, such as "before closing")
+# LOCALIZATION NOTE (SaveFilePrompt, PublishPrompt): Don't translate %title% and %reason% (this is the reason for asking user to close, such as "before closing")
 SaveFilePrompt=Save changes to "%title%" %reason%? 
+PublishPrompt=Save changes to "%title%" %reason%? 
 SaveFileFailed=Saving file failed!
 
 # Publishing error strings: