Add support for organizational sub-domains for Udemy Course downloads

[xRahul]

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If the purpose of this issue is a site support request please provide all kinds of example URLs support for which should be included (replace following example URLs by yours):

• Single video: https://www.youtube.com/watch?v=BaW_jenozKc
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Description of your issue, suggested solution and other information

Can we add support for sub domains for Udemy?
Udemy for business has sub-domains that are company specific but we are currently only supporting www.udemy.com
Example URLs:
https://google.udemy.com/the-complete-react-native-and-redux-course/learn/v4/content
https://google.udemy.com/organization/login/

Currently Downloading for Udemy only supports www.udemy.com URLs.

Let me know what else is required.

[xRahul]

@dstftw I have updated the description. Let me know what else is missing and I'll add that.

[dstftw]

You must provide concrete URLs.

[xRahul]

URLs are organisation specific. the wiXXX part can be anything. I'll update the same for google org. But this needs to be organisation agnostic.