docs: complete the python repo documentation

[OmarIthawi]

Update the python repo section and address old TODO.

This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

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[brian-smith-tcril]

Thanks for filling this out! Couple little suggestions but this LGTM!

[brian-smith-tcril]

since I've highlighted code that isn't part of the diff I can't do a suggestion, so here's my manual one:

Add a new entry under the ``python-translations`` section. For example, the XBlock located at
``https://github.com/openedx/xblock-drag-and-drop-v2`` should have the following entry::

[OmarIthawi]

done

[OmarIthawi]

@brian-smith-tcril this one is now ready.

[feanil]

Looks good to me.

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