Adapting your UI to RTL localization is a much more difficult proposition, but what well-placed dir="auto" can do is prevent an LTR-language UI from falling apart in the face of RTL user data (looking at you Gmail).
Just support English and eventually it won’t be a problem. Also put all your dates in UTC. Any other low hanging fruit we can knock out?
always export files in UTF-8
only lowercase alphabetic ascii for any path or file name, excluding space.