Disabled previous/next button aria labels

[swashbuck]

Subject of the issue

When at the beginning of a Narrative sequence / on the first slide, the Previous button's aria-label reads as:

Back to Narrative item 3 (item 3 of 3)

When on the last slide, the Next button's aria-label reads as:

Forward to Narrative item 1 (item 1 of 3), dimmed button

Since we do not have looping as a feature (as far as I know), I think these cases are both inaccurate.

Should the aria-labels be completely removed in these cases? Should they just be generic like Forward, dimmed button? To be clear, I'm only asking about when the user is on the first or last slide. No changes to the aria-labels in between.

[github-actions]

🎉 This issue has been resolved in version 7.10.1 🎉

The release is available on GitHub release

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