Add tabs: Basic and Advanced.
download subs from YT in studio after saving the video module: python part
download subs from YT in studio after saving the video module: python utils tests
download subs from YT in studio after saving the video module: python integration tests
upload subs: python part
upload subs: python utils tests
upload subs: python integration tests
fix `VideoDescriptorTest.test_get_context`
download subs: python part
download subs: python utils tests
download subs: python integration tests
Create base module.
remove subs if video sources are changed