[webui] support ja (#6698)
* add support for japanese language * add support for japanese language --------- Co-authored-by: engchina <atjapan2015@gmail.com> Former-commit-id: 88692e403f9b5085dd0c7c2b2c68656c5da50dd4
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* add support for japanese language * add support for japanese language --------- Co-authored-by: engchina <atjapan2015@gmail.com> Former-commit-id: 88692e403f9b5085dd0c7c2b2c68656c5da50dd4