@HB_OT_META_TAG_DESIGN_LANGUAGES: Design languages. Text, using only Basic Latin (ASCII) characters. Indicates languages and/or scripts for the user audiences that the font was primarily designed for. @HB_OT_META_TAG_SUPPORTED_LANGUAGES: Supported languages. Text, using only Basic Latin (ASCII) characters. Indicates languages and/or scripts that the font is declared to be capable of supporting.
Known metadata tags from https://docs.microsoft.com/en-us/typography/opentype/spec/meta
2.6.0