Run i18n_specs in a separate job

[binarygit]

Description

Creates a separate job to run i18n specs.

Fixes #2957

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Screenshots & recording

Manual review steps

1. Step 1
2. Step 2

Manual reviewer: please leave a comment with output from the test if that's the case.

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[Paul-Bob]

Right now any error in the i18n test will cancel the system tests

Let's do a separate workflow file for the i18n.

[binarygit]

Hey @Paul-Bob, error in either the system tests or the i18n one wouldn't have affected either jobs.

But I extracted out the test to a separate workflow because there was no advantage in keeping it as a job compared to a workflow. I also think it's easier to read the file now that it's a workflow. Thanks for your suggestion! 😄