If the audio language is not mentioned in the filename assume original

Currently Sonarr assumes the audio language is english when no language tag in the filename. I want either be able to set the show language manually where if the filename is not mentioned sonarr assumes the language is the set language or get the original broadcast language from the tvdb info. Even scanning the audio stream to get the audio language is not possible as for many files either it is not defined or incorrectly set to english.