InteractiveVideo: .en language file does not match semantics.json
I've noticed that the generic .en.json file in the h5p-interactive-video library does not match the structure of semantics.json. The corresponding entry for l10n.defaultAdaptivitySeekLabel does not exist in .en.json.
This mismatch means that translation tools that take .en.json as a template won't work (e.g. my Weblate installation at https://deutsche-h5p-uebersetzungscommunity.tk).