add JAPANESE language

[fumimatsu]

Added support for Japanese language and font files.

[pitts-mo]

@fumimatsu This looks good. But this PR is lacking characters added by the external Spanish script:
https://github.com/hd-zero/hdzero-goggle/blob/main/utilities/font/analyze_and_add_spanish_chars.py

@mauriciobridge are you able to merge Spanish font generation into the main script?
https://github.com/hd-zero/hdzero-goggle/blob/5cf85c9dbf07ff31c976d6c3e1677ffd07cae46d/utilities/font/generate_font_lib.py

[ligenxxxx]

@fumimatsu Please resolve the conflict.

[fumimatsu]

@ligenxxxx Conflicts resolved and keywords added by Google2.
Code points for Spanish were also added.

[ligenxxxx]

During my testing on goggle2, the app crashed during the initialization phase for unknown reasons.

[fumimatsu]

@ligenxxxx oh,sorry.i will check

[ligenxxxx]

My suggestion is to translate according to the strings in other languages ​​first, without adding or removing strings.

[fumimatsu]

Conflict with current main has been resolved and the branch has been updated to commit b986872.

I also fixed a crash risk in language initialization caused by ja_jp.ini exceeding TRANSLATE_STRING_NUM, and push builds on the fork are now passing for BoxPro / Goggle / Goggle2.

The remaining blocker appears to be GitHub Actions on the upstream pull_request runs: they are ending immediately with conclusion=action_required and zero jobs, so this looks like fork PR workflow approval is still required on the upstream repository side. Once those workflows are approved or rerun, the PR should be in a normal mergeable state.

[fumimatsu]

I tested the current branch build on my goggle hardware after updating the branch with the latest main.

Confirmed on device:

• boots normally with no language selection file present
• boots normally with JPN.TXT placed at the SD card root
• Japanese language selection works correctly on the device

So at least from my hardware test, both the default startup path and the Japanese language selection path are working.