Update the email regex so it accept the '+' sign. Fix https://github.com/YunoHost/issues/issues/1333.
Update the email regex so it accept the '+' sign. Fix https://github.com/YunoHost/issues/issues/1333.

YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/moulinette-yunohost,YunoHost/moulinette-yunohost,YunoHost/yunohost,YunoHost/yunohost