How to reproduce it :

• I open the documentary base
• I am disconnected because I do not make any move during a long time (or you can disconnect the user from an other tab)
• I click on the "new" button, a window appears, I enter the name and the description and click on "Ok"
  > and at that moment, it does not say me that I am disconnected, it seems to bug.

When the user is disconnected, something should advert the user that he could not make any action as long as he is not connected.