English is the dominating language in the field, not only in EU/US.
As a native speaker of Chinese, I know people there are using the same set of OSs, programming languages and tools. Some of them are translated into Chinese, the rest are not as harddifficult as English novels. There are a few "Chinese programming languages" that has Chinese keywords, they are not widely used or even considered less serious stuff.
Currently I am living in Japan and I see similar things here. So at least I don't think knowing Chinese or Japanese or other mysterious natural language can givegrant access to irreplaceable resources.
On the other way, I did benefit from (non language-specified) theory of semantics. In both natural language and programming language, it helped me to distinguish and refine expressions in a way similar to code review.