[Modal] Modal dialog's close button has hard-coded string

[cheer021]

## What package(s) are you using?

• [x] carbon-components
• [ ] carbon-components-react

Detailed description

Describe in detail the issue you're having.

[Modal] Modal dialog's close button has hard-coded string "Close"

Is this issue related to a specific component?

Modal control https://www.carbondesignsystem.com/components/modal/

What did you expect to happen? What happened instead? What would you like to see changed?

Either

• remove the tooltips completely so consumers can pass their own string (MORE preferred) Or
• Read the user locale and translate the string (LESS preferred - because consumers should decide where to read the locale which can be different from browser locales)

What browser are you working in?

Chrome - this is a cross-browser issue

What version of the Carbon Design System are you using?

What offering/product do you work on? Any pressing ship or release dates we should be aware of?

IBM Cognos Analytics: This issue is not gating our release

Steps to reproduce the issue

1. Open the Modal dialog
2. Hover over the close x svg
3. See "Close"

Additional information

[tw15egan]

The close button text can be changed via the iconDescription prop

You can test for yourself here, under knobs: https://react.carbondesignsystem.com/?path=/story/components-modal--playground