Although this is minor issue, it is annoying. I'm usually logged into my Google Account and my Chrome browser remembers my login. All other Google services remember my chosen language. Only Google Maps, although it remembers my location, it does not remember my preferred language. Instead it displays language of my location.
Another annoying thing is, that if I navigate away from there, it keeps the language.
The trick is to put
?hl=<culture code>, eg.
?hl=pl-PL at the end of URL. Then it already displays in my chosen language (Polish).
Is there any other place, where I can "tell" Maps what language I want to use? I already have my language in Google preferences, and it works for other things (like search, GMail, G+, etc.).