Update Japanese translation

[nishinji]

First Japanese language update in a year.
I escaped from my homework...

[stenzek]

You'll likely need to update the ImGui glyph ranges as well, I can do that post-merge, or if you want to, it's this script: https://github.com/stenzek/duckstation/blob/master/src/duckstation-qt/translations/update_glyph_ranges.py

(otherwise, if there are any new glyphs in the Big Picture strings, they won't display)

[nishinji]

I could't understand how to run it (installed python tho)
Can you do it later?

[stenzek]

No problem. Thanks for your work :)