Merge branch 'mail-fix-style' into 'stable-3.1'

Mail: domain field was only few millimeter in width in forms - now it's at least 170px

Idk if you like this solution but currently this is unviewable as you can see here
![ispc_new_mail](/uploads/b554471201aee8bbb11f64d01ec38a74/ispc_new_mail.PNG)


See merge request !316