Sorry, but not at all - most Universities teach in English - even French ones have started to do so recently, and the French are rabidly anti-English
English is the International language of science, so it makes sense for the books to be in English.
My daughter works at a Dutch University, in a department run by German Professors, needless to say the language used is generally English (she does speak Dutch as well, but not German). Interestingly, while the University all speak English, the city it's in doesn't - as it's near the German border I presume any second language is likely to be German. So while if you go to Amsterdam (or any Western city) English is universally spoken, but in the East it's pretty rare - even tourist attraction have little or no English speaking staff.
However, I can't really complain, I doubt you're going to find many speakers of Czech either
As for datasheets, something like an STM32 datasheet is going to be
HUGE - even PIC ones are - it's just a matter of occasional searching for what you're looking for.