As (AFAIK) there’s no easily accessible list of who did what, neither at Pootle for the GUI translations nor at the Userguide tool, people’s contributions are sometimes easy to miss.
Are there any translators around that weren’t yet added to the “About Haiku” credits?
Either comment here or send me a PM with the info how your name should appear there and under what language(s).
Only for the Haiku project at Pootle and its Userguide.
3rd party app contributions are credited how their maintainers see fit. The ones on Polyglot have it easy, as all contributers are listed at the bottom or the project’s page there.