Hi!
1 - It's supposed to be important (i think maybe it's better to start after you obtain some result in english, in order to not waste effort elsewhere), probably 4-6 europeans (mostly spanish/portuguese/french/germany and in my case Italian because i'm Italian), then asian languages and russian i guess. They often tell me that it's important the localization made properly but paying a professionist costs a lot, sounds more like a publisher's doing;
2 - I'd like to use external tools for analytics but due to GDPR, PIPL and CCPA i have to give up for now, because it's a damn mess with privacy laws for indie devs. I'm bound to raw analytics of Itch and Steam, which are a bit better;
3 - To be honest i'd love to find an universal font (maybe it exists, but in my case it must be a pixel font), i have big troubles in finding one and the idea of switching font by code according to whether i'm playing with asian languages or not is quite annoying