specific plugin speech-configurations that override the general configuration settings
voice feature (may not be supported by selected TTS plugin)
NOTE the root SpeechConfig should not have a specific voice-name, but only a feature specified (since it is very unlikely that all plugins support the same voice-name)
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local with 3-letter language- and country-code, separated with "-", e.g. "deu-DEU" or "eng-USA"