I don’t hear “hotspot” too often. I think it’s a holdover from when Wi-Fi was new and the next big thing. I normally say “Wi-Fi” or “wireless Internet”. Since “Wi-Fi” is a brand name and has a logo that goes with it, it’s the same in all languages — and probably the first thing I would try when visiting another country.
I think Wi-Fi is great, but I wish it would be seen as an alternative to wires rather than nearly a complete replacement. The condo I’m currently renting had the electrical redone a few months before I moved in, but they didn’t wire it for a LAN, presumably because they figured whoever got it could use wireless to go between rooms. Wireless connections are slower, less reliable, require extra hardware for desktops, and a bit of a pain to install on Linux and BSD.