languageOverride is missing from MediaContainer -> Metadata. It's only available if you've changed "Metadata language" of a library item to something other than "Library default" under "Advanced":
The format of langaugeOverride is a locale code string, e.g. sv-SE.
languageOverrideis missing fromMediaContainer -> Metadata. It's only available if you've changed "Metadata language" of a library item to something other than "Library default" under "Advanced":The format of
langaugeOverrideis a locale code string, e.g.sv-SE.