Add AppIntentVocabulary.plist for Siri

To succeed at App Store validation, we need a AppIntentVocabulary.plist with localized content to all our languages with sample phrases for INSearchForMediaIntent and INAddMediaIntent.

changed milestone to %3.5.0

added Beginner friendly Must Fix labels

mentioned in merge request !1116 (merged)

closed with commit 518567d0

closed with merge request !1116 (merged)