Irish translation for Rule

[kieran-ryan]

🤔 What's changed?

Replace English Rule with Irish Riail.

⚡️ What's your motivation?

Correct a translation for Irish; assume was added initially as a default for compatibility with gherkin v6.

See translation in teanglann.ie.

🏷️ What kind of change is this?

• 🐛 Bug fix (non-breaking change which fixes a defect)

📋 Checklist:

• I agree to respect and uphold the Cucumber Community Code of Conduct
• Users should know about my change
  • I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

[mpkorstanje]

Looks good but please keep this consistent with the other translations for the rule keyword and use the added header in the changelog.

Though I can certainly appreciate the irony of putting it under the fixed header. 😉

[kieran-ryan]

Absolutely, aligned. Additionally included a missing PR reference for the unreleased addition of the Vietnamese Tule translation to Changelog (#204).

[kieran-ryan]

Appears to be some kind of intermittent failure with the cpp jobs. Initially failed, but succeeded after re-running. Not sure whether captured under an existing issue. Believe failure was same/similar to following job run: failed cpp job. Looks like there's been recent work merged on those jobs.

Edit: Raised as #217.