Mobile layout improvements - language files

cherry picked from 657bca46

Conflicts:
	chat/css/global.css
	chat/css/mobile.css
	chat/lib/lang/ar.php
	chat/lib/lang/ca.php
	chat/lib/lang/cy.php
	chat/lib/lang/es.php
	chat/lib/lang/fr.php
	chat/lib/lang/nl-be.php
	chat/lib/lang/nl.php
	chat/lib/lang/no.php
	chat/lib/lang/pl.php
	chat/lib/lang/sl.php
	chat/lib/template/loggedIn.html