fix(windows): change canonicalization strategy for Windows 7

On Windows 7, we will no longer attempt to canonicalize BCP 47 tags in
the same was as on later OS versions, because there appear to be some
significant differences in how they work, for example, zh-CN is not
converted to zh-Hans-CN on Windows 7, whereas it is on Windows 10.

This commit also refreshes the `KLog` unit which is useful for debugging
these types of scenarios.