Add user actions to web app

web/public/static/langs/bg.json

web/public/static/langs/de.json

web/public/static/langs/en.json

web/public/static/langs/es.json

web/public/static/langs/fr.json

web/public/static/langs/id.json

web/public/static/langs/ja.json

web/public/static/langs/nb_NO.json

web/public/static/langs/ru.json

web/public/static/langs/tr.json

web/src/app/SubscriptionManager.js

web/src/app/utils.js

web/src/components/Notifications.js