localization: removed strings from old flashuploader

fixed various errors in language files

jqueryized locktimer

added 'register' and 'resendpwd' to action links and buttons

Attention: $lang['register'] has been renamed to $lang['btn_register'],
anyone using that in any plugin or template should adjust it.

Rewrite JavaScript change check

Remove wordblock action, issue a msg instead

Luxembourgish translation added