You've tried all of the suggestions listed when Googling this error? I found many, and unfortunately we can't have any idea what you've tried, because you only said you tried "a bunch," so forgive me if I am asking you to do repeats.
These caught my eye immediately:
This error is caused by an incorrect language setting, which you can change.
Reddit threads on this error, LAN settings.
A specific Reddit thread that has a solution in the first post to this error.
Complaint of this error on these forums and a solution from support that resolved the issue.
I got 807 results when searching for the specific language involved. The error (including the negative mark) in quotes, along with the words 'ffxiv' and 'launcher'.
I know you tried "a bunch of solutions" you found online, but you'll need to list what you tried in order to move forward here. Otherwise you're just going to keep getting suggestions to do things you've already tried.
Good luck.
 
		
		 
			 
			

 
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