Show disappointed elephant if web UI crashes (#10275)

* Do not crash the whole UI when loading an invalid column

* Add error boundary component to catch Web UI crashes

* Add stack trace on supported browsers

* Add component stack info, pre-format everything for github

* Make “Reload” a clickable link that calls window.location.reload()

* Remove elephant friend from error boundary, make title stand out more

* Simplify error boundary to only a graphic

app/javascript/mastodon/containers/mastodon.js

@@ -13,6 +13,7 @@ import { connectUserStream } from '../actions/streaming';
 import { IntlProvider, addLocaleData } from 'react-intl';
 import { getLocale } from '../locales';
 import initialState from '../initial_state';
+import ErrorBoundary from '../components/error_boundary';
 
 const { localeData, messages } = getLocale();
 addLocaleData(localeData);
@@ -75,7 +76,9 @@ export default class Mastodon extends React.PureComponent {
     return (
       <IntlProvider locale={locale} messages={messages}>
         <Provider store={store}>
-          <MastodonMount />
+          <ErrorBoundary>
+            <MastodonMount />
+          </ErrorBoundary>
         </Provider>
       </IntlProvider>
     );