I find this mod extremely useful, and that’s why I want to contribute Korean language support for it.
However, in the past, I’ve only worked on mods that either supported community-based multilingual translation platforms like POEditor or included an en_us.json file within the mod files.
Since this mod doesn’t follow those patterns, I’m not sure how I should provide translations for it.
Could you let me know how I can contribute translations for this mod?

Hey, so we don't actually have any translation infrastructure in Mouse Tweaks. Could you link some Forge/Fabric mods with ok translation infrastructure?

Most mods include a file located at /assets/(mod name)/lang/en_us.json to support translations.
In these cases, translators can simply add a language file such as ko_kr.json and load it as a resource pack to see the translations applied in-game.
Because of this simplicity and flexibility, most mods use this approach for localization.
Both Iris shader and Sodium follow this method.
In the case of Sodium, there is even an unofficial translation project using Crowdin, which is distributed as a separate resource pack.

Thanks. I should look into it