Merge pull request #3693 from capilkey/1.1-accessiblity-fixes

bigbluebutton-client/locale/en_US/bbbResources.properties

.../src/org/bigbluebutton/common/AccessibleNumericStepper.as

...client/src/org/bigbluebutton/main/events/ShortcutEvent.as

...rc/org/bigbluebutton/main/views/MainApplicationShell.mxml

.../src/org/bigbluebutton/main/views/ShortcutHelpWindow.mxml

...t/src/org/bigbluebutton/modules/chat/model/ChatMessage.as

.../src/org/bigbluebutton/modules/chat/views/AdvancedList.as

...ent/src/org/bigbluebutton/modules/chat/views/ChatBox.mxml

...gbluebutton/modules/users/views/BreakoutRoomSettings.mxml