Add docs note for reporting translation issues (#15631)
Fixes #15627
Summary of the issue:
Sometimes, people want to report or even fix translation or localization issues in NVDA's GitHub.
However, translation is not performed through NVDA GitHub's repo but through SVN repo.
Translation issues are usually reported through various local communities (e.g. user mailing lists) or on the translator's mailing list. This seems to work quite well, at least in the French community.
Description of development approach
Add docs note for reporting translation issues
