[Ticket/12680] - Adds alternative text to contact icon in viewtopic.php

Similar to the edit, quote, delete.... icons the new contact icon under the "joined" line, there a added some alternative text, to display when CSS is disabled. 

PHPBB3-12426 https://tracker.phpbb.com/browse/PHPBB3-12680 
I did add 
<code>'contact_user' 		=> $user->lang('CONTACT_USER', $row['username']),</code to line 1200 and <code>'CONTACT_USER'		=> $user_cache_data['contact_user'],</code> to Line 1702. 

But now, the alternative text shows always "contact friend", although you mouseover the Admin-Post-profile... :/