Accessibility: Dialog close button needs aria- label

[T-jain1995]

I'm submitting a ... (check one with "x")

[x ] bug report => Search github for a similar issue or PR before submitting
[ ] feature request => Please check if request is not on the roadmap already https://github.com/primefaces/primeng/wiki/Roadmap
[ ] support request => Please do not submit support request here, instead see http://forum.primefaces.org/viewforum.php?f=35

Current behavior

When tabbing through the paging controls with a screen reader, the dialog close button is not readout.

Expected behavior
The screen reader should speak (vi aria-label) when tabbed to each control i.e "Close button".
add aria-label to the button. Ex: aria-label = "close",

Minimal reproduction of the problem with instructions

What is the motivation / use case for changing the behavior?
This will be helpful by the specially-abled people.

Please tell us about your environment:
Windows, NPM, Angular, VSCode

• Angular version: - 9.1.9

• PrimeNG version: - 9.0.6

• Browser: [ chrome, edge]

• Language: [TypeScript - 3.8.3]

• Node (for AoT issues): node --version =

[XxOsirisxX77]

The commit that was done in here to close this issue, only adds aria-label to the approve / reject buttons, but not the close icon at the top right, which should be aria-labeled as well.