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The hacked xoopsmembers/index.php
Where you added the previous code to fetch the user rank.
Outside of that is a list of $xoopsTpl->assign('lang_Something' => _MA_SOMETHING);
Add a
$xoopsTpl->assign('lang_rank' =>
Sorry - intoxicated atm.
Seems the code for saying "Rank" at the top of the page is in some weird language file in some weird module.
If this is a modification of a personal website and nothing to do with language-selection etc. Just edit the template to say
<td>Ranktd>
instead of
<td><{$lang_rank}>td>
Not as clean code - but if you run only English on your site, it doesn't matter, really.