langs: Addition of Chinese language files - from ipfire github pull request

langs: Addition of Chinese language files - from ipfire github pull request

- These langauage files have been provided by GitHub user Opnwall as a pull request
- Tested out the result of these two patches on my vm testbed. As long as I made sure
   I had a font set installed that dealt with these types of character codes then it
   worked fine for me. I had to install noto-fonts-cjk on my archlinux system for the
   characters to be properly transcribed.
- The associated patch is where a few menu items that had no language translation have
   been changed to use the language files, presumably so that those menu names are
   shown in the Chinese characters.

Suggested-by: Opnwall
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>