Allow the modules to define the i18n messages, and other messages

required by its javascript module.

This will allow us to load the javascript modules as a static file, and
not as a Jinja2 template. This will increase the load time, as it will
decrease number of templates to be processed during loading those
javascripts.

web/pgadmin/__init__.py

@@ -59,6 +59,13 @@ class PgAdmin(Flask):
             stylesheets.extend(getattr(module, "stylesheets", []))
         return stylesheets
 
+    @property
+    def messages(self):
+        messages = dict()
+        for module in self.submodules:
+            messages.update(getattr(module, "messages", dict()))
+        return messages
+
     @property
     def javascripts(self):
         scripts = []

web/pgadmin/browser/templates/browser/js/messages.js

@@ -7,7 +7,7 @@ function(_, S, pgAdmin) {
   if (pgBrowser.messages)
     return pgBrowser.messages;
 
-  pgBrowser.messages = {
+  var messages = pgBrowser.messages = {
     'SERVER_LOST': '{{ _('Connection to the server has been lost!') }}',
     'CLICK_FOR_DETAILED_MSG': '%s<br><br>' + '{{ _('Click here for details.')|safe }}',
     'GENERAL_CATEGORY': '{{ _("General")|safe }}',
@@ -27,6 +27,9 @@ function(_, S, pgAdmin) {
     'NOTE_CTRL_LABEL': "{{ _("Note") }}",
   };
 
+  {% for key, val in current_app.messages.iteritems() %}messages['{{ key|safe }}'] = '{{ val|safe }}';
+  {% endfor %}
+
   return pgBrowser.messages;
 
 });

web/pgadmin/utils/__init__.py

@@ -66,6 +66,14 @@ class PgAdminModule(Blueprint):
         """
         return []
 
+    def get_own_messages(self):
+        """
+        Returns:
+            dict: the i18n messages used by this module, not including any
+                messages needed by the submodules.
+        """
+        return dict()
+
     def get_own_javascripts(self):
         """
         Returns:
@@ -96,6 +104,14 @@ class PgAdminModule(Blueprint):
             stylesheets.extend(module.stylesheets)
         return stylesheets
 
+    @property
+    def messages(self):
+        res = self.get_own_messages()
+
+        for module in self.submodules:
+            res.update(module.messages)
+        return res
+
     @property
     def javascripts(self):
         javascripts = self.get_own_javascripts()