Node group sockets have user-exposed data types, and sometimes subtypes for some data types (e.g. Percentage or Angle for floats). The UI to select these types and subtypes use an operator menu with a text depending on the current type or subtype. This button needs to be manually translated since its label is manually defined. Additionally, some subtypes need to be extracted from the Property class's RNA_ENUM_PROPERTY_SUBTYPE_NUMBER_ITEMS, so this commit also removes Property from the extraction blacklist in bl_extract_messages.py. This has the side effect that it introduces a few dozens translations, which are probably not used anywhere. Pull Request: blender/blender#107100