[Glitch] Change icons in web UI

Port 134de736dc to glitch-soc

Co-authored-by: Renaud Chaput <renchap@gmail.com>
Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/features/ui/components/column_loading.tsx

@@ -0,0 +1,13 @@
+import Column from '../../../components/column';
+import ColumnHeader from '../../../components/column_header';
+
+interface Props {
+  multiColumn?: boolean;
+}
+
+export const ColumnLoading: React.FC<Props> = (otherProps) => (
+  <Column>
+    <ColumnHeader {...otherProps} />
+    <div className='scrollable' />
+  </Column>
+);