Translate language & plugin settings improvement

[YU000jp]

1. [x] Translate language by using Logseq-l10n (https://github.com/sethyuan/logseq-l10n)
   • [x] Chinese (zh-CN)

     I don't understand Chinese. I had ChatGPT translate it based on the Japanese translation I made earlier. So please do the validation for this without me.

   • [x] Japanese
2. Plugin settings
   • [x] Organizing descriptions

[YU000jp]

Added

• [x] Improvement of "README" https://github.com/YU000jp/logseq-omnivore/blob/main/README.md
• [x] Japanese translation https://github.com/YU000jp/logseq-omnivore/blob/main/README.ja.md

[github-actions[bot]]

:tada: This PR is included in version 1.14.0 :tada:

The release is available on GitHub release

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