It is impossible to delete a language for good.
Latin was added by mistake to my list of languages and I simply cannot get rid of it.
When I delete it in my settings, I get a green pop up saying that the language is currently being deleted, but it still appears in my drop down menu and when I check after an hour or so, it has reappeared in my settings.
I have another active language (Korean), so I know this is not the issue.
People already reported this issue before and it would be nice if it was addressed.