@ArkadiuszMichalski said in Notepad++ 7.8.9 RC 2:
What is the practice of adding translations if the RC version already appears?
Translation files are included before doing RC, since RC means “Release Candidate”, and once RC is validated by the community (ie. no regression reported), the tested binaries are kept for the release (there are some exceptions though). The updated translation files come after RC will be included in the next release.