Fix short number formatting for numbers above million in web UI (#11559)

app/javascript/mastodon/utils/numbers.js

@@ -4,7 +4,9 @@ import { FormattedNumber } from 'react-intl';
 export const shortNumberFormat = number => {
   if (number < 1000) {
     return <FormattedNumber value={number} />;
-  } else {
+  } else if (number < 1000000) {
     return <Fragment><FormattedNumber value={number / 1000} maximumFractionDigits={1} />K</Fragment>;
+  } else {
+    return <Fragment><FormattedNumber value={number / 1000000} maximumFractionDigits={1} />M</Fragment>;
   }
 };