Merge pull request #2944 from capilkey/1.0-accessibility

bigbluebutton-client/locale/en_US/bbbResources.properties

bigbluebutton-client/resources/config.xml.template

...ebutton-client/src/org/bigbluebutton/common/TabIndexer.as

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

...luebutton/modules/videoconf/views/ToolbarPopupButton.mxml

...bluebutton/modules/videoconf/views/UserGraphicHolder.mxml

.../org/bigbluebutton/modules/videoconf/views/VideoDock.mxml