Since Mac OS X Carbon/Cocoa API isn't stable (in that it's changed multiple times over the years). Maintaining two versions of the same code (one in some foreign language with overly long names) isn't very appealing to me.
This implements count badge, progress bar, and icon overlay.
It uses the NSDockTile API which is available since OS X 10.5.
The code compiles and run on older system but without doing
anything.
This reimplement getSystemLanguage() for MacOS X because
setlocale() only works if the application is started from the terminal.
Instead we use CFBundleCopyPreferredLocalizationsFromArray() which
requires the translations to be listed in the bundle plist file (this had
already been committed). This fixes bug #3394080.
