fix(tabs): provide guidance on how to navigate between tabs

[Splaktar]

PR Checklist

Please check that your PR fulfills the following requirements:

• The commit message follows our guidelines
• Tests for the changes have been added or this is not a bug fix / enhancement
• Docs have been added, updated, or were not required

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Enhancement
[ ] Documentation content changes
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Infrastructure changes
[ ] Other... Please describe:

What is the current behavior?

No guidance is given by AngularJS Material or screen readers on how users should navigate between tabs. It is documented in WAI-ARIA Authoring Practices for Tab Panel but many users are not familiar with this.

Issue Number:
Fixes #10895

What is the new behavior?

provide guidance on how to navigate between tabs
make sure that this message can be overridden in non-English locales

Does this PR introduce a breaking change?

[ ] Yes
[x] No

Other information