Question about contributing Japanese translations

Hi,

I've been using AppFlowy in Japanese (the desktop version for Mac) and noticed that some parts of the Date & Time settings are still displayed in English.

I'd like to help translate these parts into Japanese. What would be the recommended way to contribute these translations?

For example, the following items are currently displayed in English:
Date & Time Format
Time format
Start week on

I've found the translation files under frontend/resources/translations and the translation instructions in the README, but I'm not sure whether I should simply update ja-JP.json or whether any other changes are required.
I've attached a screenshot showing the untranslated parts.

Thank you!