This wiki, like many others, has a system for finding people who know a certain language. To participate, an editor (or anyone with an account) only has to insert a userbox on their personal page. Detailed instructions are on that documentation page.
To find speakers of some language, look for its language code† among the categories here,
then look in the -N, -4, and -3 subcategories. Those will be fluent speakers.
(Specifically, N and 4 indicate native or as-native fluency, and 3 indicates proficient / advanced fluency.)
You can then contact those user(s) directly:
- For anything related to this wiki, edit their User talk page (learn how), or ping them in the Discord channel if they've given their Discord username.
- For unrelated questions, you could use any contact info they've given, or use the "Email this user" feature (which is a shortcut for this).
- Please only contact a couple people at a time!
† These are the standard ISO 639-1 (2-letter) and ISO 639-3 (3-letter) codes, e.g. en for English, de for German, etc.
The userbox documentation has more details.