[Glitch] Use plaintext value for field value tooltips in web UI

Port d185f3ddaf to glitch-soc

This doesn't change anything for glitch-style fields, but those will go
away eventually

app/javascript/flavours/glitch/actions/notifications.js

@@ -3,6 +3,7 @@ import { List as ImmutableList } from 'immutable';
 import IntlMessageFormat from 'intl-messageformat';
 import { fetchRelationships } from './accounts';
 import { defineMessages } from 'react-intl';
+import { unescapeHTML } from 'flavours/glitch/util/html';
 
 export const NOTIFICATIONS_UPDATE = 'NOTIFICATIONS_UPDATE';
 
@@ -40,13 +41,6 @@ const fetchRelatedRelationships = (dispatch, notifications) => {
   }
 };
 
-const unescapeHTML = (html) => {
-  const wrapper = document.createElement('div');
-  html = html.replace(/<br \/>|<br>|\n/g, ' ');
-  wrapper.innerHTML = html;
-  return wrapper.textContent;
-};
-
 export function updateNotifications(notification, intlMessages, intlLocale) {
   return (dispatch, getState) => {
     const showAlert = getState().getIn(['settings', 'notifications', 'alerts', notification.type], true);