Contact the wiki manager for the wiki you want to translate. That person should be listed on the Community portal which can be found on the sidebar to the left of the article area.
Depending on the size of the wiki, this might be a very large undertaking. Gathering a team to help you translate the wiki is strongly advised.
To learn more about translating wikis on Gamepedia, you can view our Translation Guidelines here: https://help.gamepedia.com/Translation_guidelines.
If you’ve completed the steps in our Translation Guidelines or if you have additional questions, feel free to submit a ticket.
For more tips on how to edit wikis, visit the Gamepedia Help Wiki.