I'm probably repeating what I posted on your appeal here for the most part but seen as you've gone to the effort of making a public thread I'll give you a reply to it.
We are a small voluntary staff team, Jagex has many payed employees handling account problems, putting the two of us in the same boat outside of game content isn't really appropriate.
I'm aware that clans often share accounts, I can also tell you that when clans are active on battlescape there is Large amount of hacking and attempted hacking. I don't have the time or will power to make decisions constantly regarding who is hacking and who is sharing, and I wouldn't ask anyone else on the staff team to do so either.
Nobody has ever received a permanent ban for flaming. At most repeat offenders will get a 3 day ban, if people are permanently banned there is a good reason for it.
Re foreign langauge, once again we have a small voluntary staff team, I do not want to spend my time translating conversations and I doubt our other staff members do either. I'd recommend setting up a discord channel between your friends if it's a big issue for you.
