a11y. Add area-labels and translations to all UI elements

[const8ine]

1. Add area-labels to all interactive UI elements e.g. buttons, tabs, expandable panels
2. Add translation strings and use them in area-label attributes instead of the hardcoded values
3. Test the coverage with Chrome accessibility tools

Use attr.aria-label="{{'your_translation' | translate}}" instead of aria-label="{{'your_translation' | translate}}" which is incorrect binding that causes error.