Enhancement: Language of Transcribe Feature based on user setting

[marcopaga]

The iOS transcription uses an english default to create transcriptions. https://github.com/maxkrieger/voiceliner/blob/66f01fc8813562353f2596ac9bc38b885863f636/lib/repositories/ios_speech_recognizer.dart#L10

I suggest taking the user locale or a setting to configure the language.

[maxkrieger]

Duplicate of #17