Add multi-langage support

[stefanfrench]

Description:

Enable the Blueprint to support multiple languages (English, French, Spanish). This includes supporting multiple languages for document pre-processing, podcast generation, and audio generation.

Acceptance Criteria:

The pre-processing component supports English, French, Spanish

The language generation components support English, French, Spanish

The audio generation components supports English, French, Spanish.

By default, the audio generated matches the language of the document uploaded

The user has the option to select which language (English, French, Spanish) to generate the audio in, irrespective of input document language

UAT (User Acceptance Test):

As a developer, I can upload a document in multiple languages (e.g., English, Spanish, French), and the system generated audio that is in the same language as the uploaded document. As a developer, I can upload a document and select the language (English, French, Spanish) that I want to audio of the podcast to be generated in.

[ylacombe]

As a quick solution for multilingual TTS support, you could use an European Parler-TTS or an Indic one. Hope that helps!