fix(FEC-10226): captions menu doesn't close with keyboard navigation in a small player

[RoyBregman]

Description of the Changes

Bug happens due to focus in the unmount of the KeyBoardAccessibility HOC which occurs before the key event bubbling is done.

• renamed onControlButtonClick to toggleSmartContaierOpen in language.js
• added preventDefault on the key 'enter' to fix the bug and avoid bubbling to the language toggle button
• fixed previouslyActiveElement so it stores only if an auto focus was done and not always - for example - in the languages the menus inside also kept the previous element (which is the same language toggle button) and when the languages were close the button was focused 4 times instead of once

CheckLists

• changes have been done against master branch, and PR does not conflict
• new unit / functional tests have been added (whenever applicable)
• test are passing in local environment
• Travis tests are passing (or test results are not worse than on master branch :))
• Docs have been updated