Hi there, this category (Forum Help > Forum Features) is for requests for the DevForum itself.
The forum already supports your requested language since it comes free since we use Discourse as the forum software which supports this language:
To request this for the Roblox platform as a whole, you are looking to post in the Feature Requests category. This category is not currently open for new posters but we will work on getting more people access in the future.
Closing this out since this request does not seem devforum-specific so it is not in the right category.