Not possible to set a custom aria-label for elements

[dimazuien]

Do you want to request a feature or report a bug?
Feature request

What is the current behavior?

Currently, close button and progress bar (and probablly other elements) have aria-labels that can't be replaced with current API. I see that it's possible to set a custom close button and add a label there but I couldn't find anything for a progress bar. The reason I need it is internationalization, I'd like to add non-english labels for it.

What is the expected behavior?

1. An additional option for CommonOptions that accepts label map for aria-labels and any other text content (more prefferred),
2. An ability to customize a progress bar the same way as a close button so a different label could be added.