We need ONE COMMON LANGAUGE here or the threads will be chaotic. Like it or not, the language most common to this community, and thus the standard for RCU, is English.
Absolutely. There's a word for using a foreign language in the company of others so others cannot understand what is being said - rudeness. It's not the least bit clever & many people find it offensive. If you want to talk to a countryman in your own language, that's fine, send them a PM. If you don't like the RCU policy of not posting in English that's fine too. Post somewhere else. - John.