docs: XBlock JavaScript translations OEP-58

[OmarIthawi]

Documents JS translations feature in the platform:

• https://github.com/openedx/edx-platform/pull/33698

Preview link:

• https://github.com/Zeit-Labs/docs.openedx.org/blob/xblock_js/source/developers/how-tos/enable-translations-new-repo.rst#configuration

This pull request is part of the FC-0012 project which implements the Translation Infrastructure update OEP-58.

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[OmarIthawi]

Thanks @brian-smith-tcril. The changes are fine. Commit can be less GitHub-y if we'd ever move out of.

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