1.7.11

1. Support standard capitalization of "au" in units parsing
2. Add location code ST (Statio) for landing sites
3. Localization update
4. Data update (ISS has been removed)
5. Fix bugs

celestiamobile/Celestia@fd8624a
celestiamobile/CelestiaLocalization@95727e9
celestiamobile/CelestiaCore@7c6f59d
CelestiaProject/CelestiaContent@e804551