[Other] Support other languages

[turtton]

What is this?
A clear and concise description.
なにをするかなどの説明

I'm planning to use this service.
https://www.transifex.com/home/

Java library licensed under Apache-2.0License
https://github.com/transifex/transifex-java

CheckList

• This is not bug report or feature request.
  これはバグ報告でも機能の提案でもありません

[turtton]

it looks good for this project

https://hosted.weblate.org/

[turtton]

^^;

[turtton]

I'll just add the Japanese manually for now...