[Glitch] Fix performance of home feed regeneration

Port front-end changes from f665901e3c to glitch-soc

Signed-off-by: Thibaut Girka <thib@sitedethib.com>

app/javascript/flavours/glitch/components/regeneration_indicator.js

@@ -0,0 +1,18 @@
+import React from 'react';
+import { FormattedMessage } from 'react-intl';
+import illustration from 'flavours/glitch/images/elephant_ui_working.svg';
+
+const MissingIndicator = () => (
+  <div className='regeneration-indicator'>
+    <div className='regeneration-indicator__figure'>
+      <img src={illustration} alt='' />
+    </div>
+
+    <div className='regeneration-indicator__label'>
+      <FormattedMessage id='regeneration_indicator.label' tagName='strong' defaultMessage='Loading&hellip;' />
+      <FormattedMessage id='regeneration_indicator.sublabel' defaultMessage='Your home feed is being prepared!' />
+    </div>
+  </div>
+);
+
+export default MissingIndicator;