feat!: remove Transifex calls for FC-0012 - OEP-58

[shadinaif]

Breaking change!

---

This PR depends on #81 and contains a cherry-pick from it until that one is merged

---

This change breaks the Jenkins transifex integration which has been deprecated in favor of the new GitHub Transifex App integration as part of OEP-58.

Changes

• Removes direct use of tx pull and tx push commands from the XBlock to let Open edX manage it.
• Remove source and language translations from the repositories, hence no .po or .mo files will be committed into the repos.
• Remove Transifex related Makefile targets and configuration files.
• Use the OEP-58 JavaScript translations from the Open edX platform

Merge timeline

This should only be merged after Translation Infrastructure update OEP-58 is fully implemented.

The timing announcement will be shared by @brian-smith-tcril on #translations-project-fc-0012 Open edX Slack channel.

## Keep this pull request as a draft to prevent an accidental merge. ##

Pre-merge checklist

• Deprecate pre-OEP-58 Transifex scripts from all repositories wg-translations#20 is approved

References

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

Up-to-date project overview and details are available in the Approach Memo and Technical Discovery: Translations Infrastructure Implementation document.

Join the conversation on Open edX Slack #translations-project-fc-0012.

Check the links above for full information about the overall project.

[openedx-webhooks]

Thanks for the pull request, @shadinaif! Please note that it may take us up to several weeks or months to complete a review and merge your PR.

Feel free to add as much of the following information to the ticket as you can:

• supporting documentation
• Open edX discussion forum threads
• timeline information ("this must be merged by XX date", and why that is)
• partner information ("this is a course on edx.org")
• any other information that can help Product understand the context for the PR

All technical communication about the code itself will be done via the GitHub pull request interface. As a reminder, our process documentation is here.

Please let us know once your PR is ready for our review and all tests are green.

[shadinaif]

for your review please @OmarIthawi

[OmarIthawi]

@shadinaif I've pushed new changes but please update the README, and we need one more test on your devstack before moving this to ready for merge.

[OmarIthawi]

Done @brian-smith-tcril!

[openedx-webhooks]

@shadinaif 🎉 Your pull request was merged! Please take a moment to answer a two question survey so we can improve your experience in the future.