From my experience the amount and the quality of resources available in English is simply not comparable with any other language. Surely it is possible without but much harder. I am Italian, during my studies I had the chance to read technical books both translated and in original language. The translation is usually very poor. On a daily basis work scenario, no Italian online resource would come close to stackoverflow to help diagnose issues quickly. Moreover, it takes time for official documentations to be translated in other languages. Even years in some times. It really depends on your sector. If you work in a niche area where you don’t necessarily need to be up to date with the industry you could survive without English.