Required commit in flightgear branch for temperature calculation
I've rerun FGMeta's fg-copy-weather-scenarios-to-default-locale (new version from FGMeta commit d259ec0b7674213). This added the "This file was automatically generated (...)" comment at the top of Translations/default/weather-scenarios.xml.
Add IDs to the scenarios, and use a script (in FGmeta) to populate the default translation based upon this.