WIP: fix(formats): do not copy template notes for new translations

[gzm0]

Proposed changes

Do not copy the notes (comments) from the template/source when adding a translation for a key (in monolingual formats).

This fixes #11133. Copying the notes is problematic because the are not synced when they are updated. As a result, they can get out of date.

The implicit assumption behind this change is that most users only care about comments in source files (but not in target files).

Checklist

• [ ] Lint and unit tests pass locally with my changes.
• [ ] I have added tests that prove my fix is effective or that my feature works.
• [ ] I have added documentation to describe my feature.
• [ ] I have squashed my commits into logic units.
• [ ] I have described the changes in the commit messages.

Other information

[gzm0]

Still WIP, because I have not figured out how to:

• run unit tests
• log into the development weblate (I managed to start it).

Any help greatly appreciated.

[gzm0]

Question regarding review / commits: Do you prefer if I keep a commit history for evolution and squash at the end or if I prepare the branch as I would propose to merge it on every review round?

Also: I'm still trying to figure out how to actually run my unit tests and how to log into the local dev weblate (as admin that its). If you have pointers, highly appreciated.

[nijel]

I usually squash commits when merging, so I'm not really concerned about evolution of the commits.

[nijel]

Ah, I didn't notice this:

* run unit tests

This should be documented at https://docs.weblate.org/en/latest/contributing/tests.html

* log into the development weblate (I managed to start it).

If you're using rundev.sh, the admin password was printed on the first start. You can create new admin or update the password using https://docs.weblate.org/en/latest/admin/management.html#createadmin