Language is not a requirement to live/work in Croatia. There's a huge expat community in Croatia, I have met many Canadians and US citizens who came here and got their job because of their great English. Yes, working as an English teacher, or translator, or any language related job is a bit boring, but for tech people there's a huge demand and English-only is perfectly fine.

Food has labels in English, restaurants and everything else, because of tourism, are very English oriented. It's a great place for foreigners.