Whenever I click on it it does absolutely nothing. This a bug or has it just not been added yet? Because, well, you know, Irish is in Beta. Help?
There is no Immersion for Irish yet. If you can still see the word Immersion at the top of the page then this is because you have changed from another language that does have Immersion and so the link is still there. Simply refresh the page (f5 on windows) and the link will magically disappear :)
It's faulty. If you've been looking at Spanish and move to Irish, you'll still see the tab. Do it the other way around and the immersion tab will be missing in German etc, even though it should be there. What's not clear is whether, if you can get to the upload page, you can upload something in Irish for translation (because once you're at that page, you're not limited by the language you last used). It may just refuse to upload it.