Seems to truly fix setupTheming loading across browsers.

js/themes.js

@@ -50,3 +50,9 @@ function setupTheming() {
     }
   });
 }
+
+$(document).ready(function() {
+  i18next.init((err, t) => {
+    setupTheming();
+  });
+});

js/translations.js

@@ -53,7 +53,6 @@ i18next
   });
   // init set content
   $(document).ready(initialize);
-  $(document).ready(setupTheming);
 
   let delayTimer;
   $(document).on('input', function(event) {