From what I understand, it is possible to make a mod that adds locales to anither mod, without needing to copy the entire mod. This way you can get updates from the original mod author but can maintain the translation separately. I see your pull request in Magu's github, thanks for contributing!

For example:
https://mods.factorio.com/mod/SE-locale/downloads

From what I understand, it is possible to make a mod that adds locales to anither mod, without needing to copy the entire mod. This way you can get updates from the original mod author but can maintain the translation separately. I see your pull request in Magu's github, thanks for contributing!

For example:
https://mods.factorio.com/mod/SE-locale/downloads

thanks but how to remove mod from mod portal?

You can mark it deprecated to not appear in search.

Or you can delete the old Zip file from this mod's downloads, and upload a new Zip file with just the locale and a new name like "Electric Train ZN-CH Locale". You can also include a dependency on the original mod so people know which one it is for.