This is the link with text that's controlled
"MediaWiki:contribslink" page; it appears as "contribs"
You can always override MediaWiki messages by editing
pages in the MediaWiki namespace as somebody who
has 'editinterface' right (sysop is enough by default).
If the message is empty though the hard-coded default
will be used.
You can go for a CSS solution or you can introduce
a dirty hack by commenting out
$items = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(),
in includes/Linker.php file.