Make browser only

src/lib/components/DateTime.svelte

@@ -1,4 +1,6 @@
 <script>
+    import { browser } from "$app/environment";
+
     /** @type string | undefined */
     export let datetime = undefined;
     /** @type "date" | "dateTime" | "time" */
@@ -23,7 +25,7 @@
     }
 
     const formattedDate = Intl.DateTimeFormat(
-        navigator.language,
+        browser ? navigator.language : "en",
         options,
     ).format(date);
 </script>