Update Japanese localization based on the latest codebase (#2509)

* Update Japanese localization based on the latest codebase

* Improve translations based on suggestions in reviews

Co-authored-by: oboenikui <[email protected]>

* Update messages.po

Co-authored-by: Noritada Kobayashi <[email protected]>

* Make corrections and improvements suggested

Co-authored-by: L-tan <[email protected]>

* Translate 9 new messages

* Improve a translation

* Translate 23 new messages

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Co-authored-by: oboenikui <[email protected]>
Co-authored-by: Hima <[email protected]>
Co-authored-by: L-tan <[email protected]>