Localized the overlay.
Attempted to fix #16, but it's still cached somewhere.

According to MSDN, the default value for the parameterless method is a MaxAge of Zero as well, so no caching of GPS results should have happened in the first place...

(I am aware that this commit message will probably close #16. This is intentional - if I can't fix it, I might as well close it, labeled as "cantfix".)