OPSO :
Sure, nothing happened. So no problem, right ?
In the event you described, no. It would seem you perhaps do not understand the basics of what ATC is supposed to do and what the PIC responsibilities are as far as separation is concerned in controlled airspace in IFR/IMC..
An unpleasant feeling to hear an aircraft being given instructions in another language you do not understand while you are performing an approach in IMC, I fully understand it, been there myself, and would agree with you. But really an unsafe or problematic situation ? No.
Done everyday all around the world to hundreds of thousands of flights without problems.