Add className for fields.
Add tabs: Basic and Advanced.
Work in progress.
Work in progress.
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
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fix `VideoDescriptorTest.test_get_context`
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