clean up code / add formatted messages / fix bugs

bigbluebutton-html5/imports/api/polls/server/methods.js

...on-html5/imports/api/polls/server/methods/initiatePoll.js

...utton-html5/imports/api/polls/server/modifiers/addPoll.js

bigbluebutton-html5/imports/startup/client/routes.js

bigbluebutton-html5/imports/ui/components/app/styles.scss

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

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

bigbluebutton-html5/imports/ui/components/poll/styles.scss

bigbluebutton-html5/private/config/settings-development.json

bigbluebutton-html5/private/locales/en.json