More translation readyness.

git-svn-id: http://yourls.googlecode.com/svn/trunk@860 12232710-3e20-11de-b438-597f59cd7555
Translation readyness of admin/tools.php

git-svn-id: http://yourls.googlecode.com/svn/trunk@861 12232710-3e20-11de-b438-597f59cd7555
Translation leftover in admin/plugins.php

git-svn-id: http://yourls.googlecode.com/svn/trunk@862 12232710-3e20-11de-b438-597f59cd7555
Translation leftovers in admin/tools.php

git-svn-id: http://yourls.googlecode.com/svn/trunk@863 12232710-3e20-11de-b438-597f59cd7555
Translation readyness for admin/upgrade.php

git-svn-id: http://yourls.googlecode.com/svn/trunk@864 12232710-3e20-11de-b438-597f59cd7555