For the Voice Dictation object to correctly recognize a specific language it must be supplied with an engine supporting the specific language. Most features of the Voice Dictation object will work without any localization of the object, but some features require localization.
Features that need localization:
Default Global Glossary- If no default table for the global glossary exist for the specific language then nothing will be loaded in. An application or user could add their own in. Punctuation is handled by the glossary.
Built-In Commands - If a translation table for the built-in commands does not exist then the English-named commands will be loaded in. An application or user could rename them into the vernacular.
Inverse Text Normalization - If the localized default CFG is not available then the application will need to set one.