fix(contact): allow one letter domain for email
fix(contact): allow one letter domain for email

cf. https://yeswiki.net/forum/?qa=4282/action-contact-mod%C3%A8le-nom%40e-reconnu-valide-formulaire-contact
YesWiki/yeswiki,YesWiki/yeswiki,YesWiki/yeswiki,YesWiki/yeswiki