Carousel: Improve button accessibility

[hollymiller525]

The carousel navigational links ( p-link ) are failing accessibility checks. The button is empty or has no value text.

I'm submitting a ...

[x] bug report
[ ] feature request
[ ] support request

Current behavior
The p-link button within the carousel is empty and has no value text

Expected behavior
Include text attribute to the button

React version:
16.12.0

PrimeReact version:
3.4.0

Why It Matters
When navigating to a button, descriptive text must be presented to screen reader users to indicate the function of the button.

How to Fix It
Place text content within the element or give the element a value attribute.

** Found via WAVE Web Accessibility Evaluation Tool

[melloware]

Looks like there needs to be text inside the presentation element which is hidden with displayNone

<button type="button" class="p-carousel-next p-link">
   <span class="p-carousel-next-icon pi pi-chevron-right"></span>
  <span role="presentation" class="p-ink"></span>
</button>

Should be:

<button type="button" class="p-carousel-next p-link" aria-label="Next Page">
   <span class="p-carousel-next-icon pi pi-chevron-right"></span>
  <span role="presentation" class="p-ink"></span>
</button>