[a11y] Fix missing aria-label in pagenavigation

[chmst]

Pull Request for Issue # .

Summary of Changes

The <nav in pagenavigation needs an aria-label.

Testing Instructions

You need a site where you have a pageanavigation.
Inspect the sourceode before and after patch

Actual result BEFORE applying this Pull Request

No aria-label for the <nav element

Expected result AFTER applying this Pull Request

Link to documentations

Please select:

• Documentation link for docs.joomla.org:

• No documentation changes for docs.joomla.org needed

• Pull Request link for manual.joomla.org:

• No documentation changes for manual.joomla.org needed

[brianteeman]

I have tested this item ✅ successfully on aab5d65

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[Quy]

I have tested this item ✅ successfully on aab5d65

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43600.}

[Quy]

RTC

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_{This comment was created with the J!Tracker Application at issues.joomla.org/tracker/joomla-cms/43600.}

[MacJoom]

Thank you!