[SOLVED] Language files in other languages than English

What sv3tli0 is saying is that you do not need to touch the languages in the system directory - leave them as is, but create your own in the application directory so that they will override the ones in system. That is explained in the docs.

As far as contributing goes, the language file distributed with CI is just a default. It is not part of the framework's code and in many cases will be over-ridden according to the specific app being developed. So a translation of it isn't really a contributable part as such. However, there are probably other CI devs that would find it useful. So you could stick it up on github and create a link to it in the forums, and I'm sure your contribution will be appreciated!