feat: add i18n property to menu bar

[web-padawan]

Description

Same as #2381 but from the branch in this repo.

To be accessible, the menu bar overflow button needs the aria-label attribute to be set.
The attribute should be localizable. As such, this adds an i18n object to the menu bar,
and uses it to set the aria-label of the overflow button.

Connected to #87

Type of change

• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs-beta/latest/guide/contributing/overview/
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.

Additional for Feature type of change

• Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[eriklumme]

I'm assuming the 0.01% screenshot difference is not caused by this task.

As for the failed tests, sorry for that, didn't realize I hadn't run on Firefox. It seems like it can be fixed by changing aria-label= to aria-label$=. However, this is not from my branch anymore. How should we proceed? :)

[web-padawan]

I'm assuming the 0.01% screenshot difference is not caused by this task.

Yes, this is a known problem specific to this component.

As for the failed tests, sorry for that, didn't realize I hadn't run on Firefox. It seems like it can be fixed by changing aria-label= to aria-label$=. However, this is not from my branch anymore. How should we proceed? :)

Thanks, fixed.

[web-padawan]

The PR is green and IMO it is ready to go 👍 But it needs another review as I can't approve my own PR.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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[vaadin-bot]

This ticket/PR has been released with platform 22.0.0.alpha2 and is also targeting the upcoming stable 22.0.0 version.