[a11y] Add aria attributes where needed

[maxpatiiuk]

• Add aria attributes where needed.
• Make sure these attributes are supported and are properly picked up by screen readers
• Make sure there are no inappropriate usages of aria attributes. Use native semantic markup frequently and ARIA sparingly.
• Check if usages of aria-label can be replaced with aria-labeledby
• Add usages of aria-describedby
• Evaluate usages of aria-label. Add usages (i.e, for notifications)
• Research aria-live=”status” and others

Begun doing this in 0c8a41a, and other commits