[Lokalise] Add new translations language

[yohru]

I would like to add Japanese to the translation language of homeassistant-truenas.

[tomaae]

Launguage added

[yohru]

There is a Japanese item on lokalise, but I can't access it.

[tomaae]

you didnt added japanese language to your contributable languages. I have added it for you.

[yohru]

ok im confirmed