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SRT files:  technical specs

https://www.matroska.org/technical/specs/subtitles/srt.html

Google translatre API pricing:  https://cloud.google.com/translate/pricing

Translation API - Google Cloud Python Tutorials p.5   

Widget Connector
url https://www.youtube.com/watch?time_continue=528&v=6wlzeDaIGtw

Azure Translator Text API

https://azure.microsoft.com/en-us/pricing/details/cognitive-services/translator-text-api/