Replace send_messages and manage_service strings across application with ServicePermission.SEND_MESSAGES and ServicePermission.MANAGE_SERVICE types

app/__init__.py

@@ -359,6 +359,11 @@ def init_app(application):
     def _attach_current_user():
         return {"current_user": current_user}
 
+    @application.context_processor
+    def _attach_enums():
+        from app.enums import ServicePermission
+        return {"ServicePermission": ServicePermission}
+
     @application.context_processor
     def _nav_selected():
         return navigation