fix user-sent poll result messages

...ports/api/group-chat-msg/server/modifiers/addSystemMsg.js

...luebutton-html5/imports/api/polls/server/eventHandlers.js

...tml5/imports/api/polls/server/handlers/sendPollChatMsg.js

...chat/time-window-list/time-window-chat-item/component.jsx

...ist/time-window-chat-item/message-chat-item/component.jsx

bigbluebutton-html5/imports/ui/components/poll/component.jsx

bigbluebutton-html5/imports/ui/components/poll/container.jsx

...tml5/imports/ui/components/poll/live-result/component.jsx

bigbluebutton-html5/imports/ui/components/poll/service.js

bigbluebutton-html5/private/config/settings.yml