finish shared content across templates

frontend/src/components/canvas/utils.js

frontend/src/views/basic_photo_banner/BasicPhotoBanner.vue

frontend/src/views/facebook_survey/FacebookSurvey.vue

...src/views/newspaper_quote_middle/NewspaperQuoteMiddle.vue

frontend/src/views/text_banner/TextBanner.vue

frontend/src/views/twitter_banner/TwitterBanner.vue

...iews/urgent_basic_photo_banner/UrgentBasicPhotoBanner.vue

frontend/src/views/urgent_text_banner/UrgentTextBanner.vue