Removes nested PHP-block in menu's edit.html.
Fixes #61 saving dish showing blank page when form invalid.
Adds translations for dishes edit screen.
Updates dish edit i18n :astonished:.
Merge branch 'master' of https://github.com/SEP007/lmvc-patat

* 'master' of https://github.com/SEP007/lmvc-patat:
  Fixes restaurant signup page