Transition to new Transifex CLI

[christophmeissner]

The current Transifex CLI is deprecated and will cease working on Nov 30, 2022. We will need to migrate to the new Go based client (see https://github.com/transifex/cli) until then.

From Transifex documentation at https://docs.transifex.com/client/pull/:

We released a stable version of a new Transifex Client, compatible with the API 3.0, and offered as single executable.

Please start using the new Transifex CLI here, since this software is considered deprecated (as of January 2022) and will sunset on Nov 30, 2022.

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Steps to success

• Check and update tx project settings for compatibility when using new tx client
• update documentation on how to update translations
• ???
• Profit!