I checked translation status of https://www.transifex.com/ideditor/id-editor/dashboard/ and here is what is missing at forum (90%> translations):
countries:
- Japan - #12 in http://osmstats.neis-one.org/?item=countries&date=5-2-2016
- China - #23 in http://osmstats.neis-one.org/?item=countries&date=5-2-2016
- Vietnam #153 in http://osmstats.neis-one.org/?item=countries&date=5-2-2016
languages (forum interface)
- Japanese
- Portuguese (different from pt-br?!)
- Vietnamese
- Hungarian