Try use more system locale

Hopefully locale doesn't change half way

src/utils/nice-date-time.js

@@ -1,9 +1,10 @@
+const { locale } = new Intl.DateTimeFormat().resolvedOptions();
+
 function niceDateTime(date, { hideTime, formatOpts } = {}) {
   if (!(date instanceof Date)) {
     date = new Date(date);
   }
   const currentYear = new Date().getFullYear();
-  const locale = new Intl.DateTimeFormat().resolvedOptions().locale;
   const dateText = Intl.DateTimeFormat(locale, {
     // Show year if not current year
     year: date.getFullYear() === currentYear ? undefined : 'numeric',

src/utils/shorten-number.jsx

@@ -1,5 +1,7 @@
+const { locale } = Intl.NumberFormat().resolvedOptions();
+
 export default function shortenNumber(num) {
-  return Intl.NumberFormat('en-US', {
+  return Intl.NumberFormat(locale, {
     notation: 'compact',
   }).format(num);
 }