Fixed #2814 (sign in whenusername contains non-ascii chars)
Fixed #2814 (sign in whenusername contains non-ascii chars)

lino-framework/lino,lsaffre/lino,lsaffre/lino,lsaffre/lino,lino-framework/lino,lino-framework/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino