@bender-tags: feature, 4.9.0, 1338
@bender-ui: collapsed
@bender-ckeditor-plugins: toolbar, wysiwygarea, basicstyles

1. Hover on each button until tooltip appears.
1. Check the tooltip content:

## Expected

Tooltip should show hotkeys for each button:
* Strike - Ctrl (⌘) + F5
* Subscript - Ctrl (⌘) + F6
* Superscript - Ctrl (⌘) + F7
