Language files update

Language files from old repo: https://github.com/cpw/compactsolars
- zh_CN by @t106ao from: https://github.com/cpw/compactsolars/pull/26
- el_GR by @vasouv from: https://github.com/cpw/compactsolars/pull/27
- tr_TR by @toltol from: https://github.com/cpw/compactsolars/pull/29

These files shouldn't be lost.