transifex-client must be replaced with transifex CLI tool

[rffontenelle]

The old transifex-client uses the Transifex APIv2 which is deprecated as of January 2022 and will sunset in the end of November 2022. It is recommended to update your automation workflow to install the new transifex CLI tool, which is implemented in Go language. See Introduction to the Client for more information about this client.

The summarize the steps I see so far:

1. Set to install the new client:

 - name: Instala el cliente Transifex
   run: curl -o- https://raw.githubusercontent.com/transifex/cli/master/install.sh | bash
   working-directory: /usr/local/bin

2. Change requirements.txt removing "transifex-client" (old client)
3. Change requirements.txt replacing "sphinx-intl" with git+https://github.com/sphinx-doc/sphinx-intl@6b3913fea5a8c9b819818b9b28b6d0d0b6f022b3 (that's the first yet-unreleased commit of sphinx-intl that supports the new Transifex CLI tool)
4. Update CONTRIBUTING.rst to make sure it mentions the installation of the new client, as well as the instructions are updated with the output of the new client.

Keep an eye on sphinx-intl #75; as soon as released, revert step 3

[cmaureir]

Hey @rffontenelle thanks for the heads up.
IIRC we don't use transifex on this project, and the requirement you saw is something a bit old.

Maybe @raulcd @humitos can confirm this was left there historically, rather than being a real dependency.

[raulcd]

Thanks @rffontenelle !
The transifex-client seems to be coming from this commit: 2a74cca
It does not seem to be used. We have never used transifex as far as I am aware. We can probably remove the dependency from requirements.txt. I can validate tomorrow and create a PR.

[raulcd]

Sorry, it is coming from this commit 1d7fa53 where we seemed to be testing transifex but we did not use it eventually. I'll take a look.

[raulcd]

transifex-client and other references to transifex have been removed from the project. Thanks