Move template sandbox to its own app

Improve UI for the sandbox template textarea.

Signed-off-by: Roberto Rosario <roberto.rosario@mayan-edms.com>

contrib/scripts/process_messages.py

@@ -17,8 +17,8 @@ APP_LIST = (
     'file_metadata', 'linking', 'lock_manager', 'mailer',
     'mayan_statistics', 'metadata', 'mirroring', 'motd', 'navigation',
     'ocr', 'permissions', 'platform', 'rest_api', 'smart_settings',
-    'sources', 'storage', 'tags', 'task_manager', 'user_management',
-    'web_links'
+    'sources', 'storage', 'tags', 'task_manager', 'templating',
+    'user_management', 'web_links'
 )
 
 LANGUAGE_LIST = (