Add Japanese translation and localized tag

[ryonakano]

• Confirmed UI is translated into Japanese:

• Confirmed you can select Japanese tag from Settings:

• Confirmed searching in Japanese works:

[mijorus]

thanks, I did not include Jp previously because I couldn't test it properly on my machine, maybe I don't have the right language packs or something, the UI was all messed up.

From your screenshots, everything looks good to me