set own gui lang

in the core code following langs are defined:
english, cs, es, fr-ca,ga,it,lt,pl,pt,sr
but you easily set your own lang, translate and lastly share your translation:)
here is example for german standard:
1. add into config_rr.php
$config['guilangs']['de'] = array('path'=>'de','val'=>'deutsch');
/** where
  the key 'de' is language code
  value for 'path' is directory name in application/language
  value for 'val' is language name in that language
*/
2. create directory in application/language
3. create empty php file 'rr_lang.php in that folder
4. set prope apache owner for created folder and file

then you need to just translate into your specified language :
doc: http://jagger.heanet.ie/jaggerdocadmin/langs.html#translation