For a quick test, use a non-en locale, try installing something that you can still operate without understanding and has translations enabled. That will trigger all kinds of issues. I recommend a far-east language (but I don't know what has translations ATM) or something as simple as German, which should have translations and enough non-ASCII characters to cause trouble.

If that works for you (using LANG=C fallback) then say so, I assume it breaks so far