New languages

KR, CN, CN-M, JP
Revert "New languages"

This reverts commit a788a419f517b9a46371a2e9c4782b2080373c57.
Language Chinese

This is the translation into Chinese Simplified spoken on Mainland
China.
Changing language code
Merge remote-tracking branch 'origin/master' into spreed-speakfreely-chinese
Added Chinese languade code
Korean language

Korean langage used in south Korea
Renamed language code
Added korean language
Enabled Korean translation.
Merge branch 'master' into spreed-speakfreely-chinese

Conflicts:
	src/i18n/helpers/languages.py
Merge branch 'spreed-speakfreely-chinese' of https://github.com/cfrisemo/spreed-speakfreely
Added support for combined language codes.
Properly encode languages as JSON.