[a11y] add aria-keyshortcuts#2762

vinicius73 merged 7 commits intomasternextcloud/text:masterfrom

2735-bitva11y-currently-keyboard-accessible-using-keyboard-shortcuts-common-in-text-editors-however-there-is-a-wai-aria-best-practicenextcloud/text:2735-bitva11y-currently-keyboard-accessible-using-keyboard-shortcuts-common-in-text-editors-however-there-is-a-wai-aria-best-practiceCopy head branch name to clipboard