The original FH1 map was named Seelow Heights. That's about all of the thought that went into naming the FH2 version and it won't be changed. I believe its more of a pain in the ass than it's worth to rename maps.
Also, by your logic, we would be renaming a lot of maps to their original names in the language they're supposed to be in.
In the end tho, it's more work than it's worth and there's gotta be a better reason for it than 'it's a German area.'