Skip comments and allow capital letters in locale extractor

[HebaruSan]

Problems

• Locale configs with comments aren't always parsed correctly, see [Bug] Minor parsing issues in locale extractor #2782 for examples
• Locale strings with capital letters aren't parsed correctly, again see [Bug] Minor parsing issues in locale extractor #2782
• If the localizations property is set in the netkan (none are yet), we still parse all the cfg files but then throw away the result

Changes

• Now we make sure that between the beginning of the line and the locale descriptor is only whitespace (since // isn't whitespace, comments are ignored)
• Now we allow capital letters in locale strings
• Now if the localizations property is already set, we don't parse anything and just move on to the next transformer

Fixes #2782.

[HebaruSan]

I think we need this to fix the bot freezing as well. When I was testing with CommunityRealAgencyPack, the old code took a long time to process while the new finished quickly, and I observed the same with the bot via the status page.

[DasSkelett]

I spot no obvious problems, and it works 👍