App update

Submodule web/app 1834767..43e7474:
  > Add TODO tags
  > Add comments for each function in the module.py file
  > Identation patch
  > Add TODO for the login and password reset functions
  > Check if the email passed is not None in the do_password_reset_thread() function
  > Use the session_clear_and_prepare() function on logout
  > Refactoring the version() function
  > Move the casting of the account_type to the setting of the session variable
  > Remove useless variable passed to the index.html jinja template