Wikimedia Bugzilla is closed!

SpecialUserlogin.php using wgLang to ignore a returnto=Special:Userlogout, this fails for user with an other language than the content.

I think it is better to use wgContLang for the code in SpecialUserlogin.php: 
# When switching accounts, it sucks to get automatically logged out
if( $this->mReturnTo == $wgLang->specialPage( 'Userlogout' ) )
{
 $this->mReturnTo = '';
}

You can test it by setlang!=en on translatewiki an than try to login, when there is a returnto=Special:UserLogout in the url