Fix in app.js

Reset the errors whenever the request has succeed
Destroy

The function publishDestroy receive now the complete object and not just its id.
Destroying a topic now remove topics from the chat and associated subject from the messages.
API errors

Adapt error message in accordance with the language file.
Remove the crash redirect when the app page has some 403 errors.
Permissions

chat/participants is allowed for meta members as well as members.