My editing

I'm trying to learn the French language and the Irish language right now. Could that be my niche topic, adding words from those languages? Or does wiktionary frown on excessive foreign words being added to it? I know it does have some foreign words, I've edited and created articles on some myself here.

We absolutely encourage foreign words. I was myself working on French and Haitian Creole before my long hiatus from Wiktionary. But if you don't know the language well, be sure that your contribution is correct by checking other sources before you add it. There are only a handful of Irish editors, so there are not that many people available for fixing mistakes.

Overall, Wiktionary has almost as many articles as Wikipedia, and a small fraction of the number of editors, so we can't check every entry for correctness. The responsibility is more on the creators of entries to verify that they are correct.