feat: Special support for XBlocks

[shadinaif]

feat: Special support for XBlocks

XBlocks require text.po and textjs.po instead of django.po and djangojs.po. This PR will add support to find XBlock translation files and rename them to django during translation extraction.

Why is this needed?

After moving along with standardizing make extract_translations in XBlocks; we found that it's safer to keep text.po and textjs.po as the translation domains for XBlocks. It's to preserve compatibility with in-repo translations since it'll be used for a while by the community

See this related conversation openedx/edx-cookiecutters#382 (comment)

• Tested in a forked PR https://github.com/Zeit-Labs/openedx-translations/pull/67/files. The tested XBlock is a fork containing text.po as the domain for translation https://github.com/Zeit-Labs/xblock-drag-and-drop-v2/blob/9956abde00175e3d53dff53502b10fafbd6af0d3/Makefile#L12

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[shadinaif]

This is ready @OmarIthawi @brian-smith-tcril

[brian-smith-tcril]

This LGTM, I'll wait to see if @OmarIthawi has any feedback before merging.

[OmarIthawi]

@shadinaif I agree with the overall process. However, the implementation is becoming a bit cumbersome.

Nevertheless, I think we should refactor this file eventually. Therefore, I've added an issue for that:

• chore: simplify the extract translation bash scripts of git add the translation source files #606

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