Improve error handling : Add pages (no rights error, common error page) , catch potential http 401,403,404 and 500 errors

[MichaelC67]

A common error page should give access to the Help Page and the ability to disconnect and perhaps add a message explaining which userId is concerned.

[MichaelC67]

The app also should be able to add message when no survey is found.

[MichaelC67]

Another example where a 404 error isnt catched.