asynctask.js: Fix gettext being used before translations are loaded (Z#23204825)

src/pretix/static/pretixbase/js/asynctask.js

@@ -8,15 +8,16 @@ var async_task_is_long = false;
 var async_task_dont_redirect = false;
 
 var async_task_status_messages = {
-    long_task_started: gettext(
+    // These are functions in order to be lazily evaluated after the gettext file is loaded
+    long_task_started: () => gettext(
         'Your request is currently being processed. Depending on the size of your event, this might take up to ' +
         'a few minutes.'
     ),
-    long_task_pending: gettext(
+    long_task_pending: () => gettext(
         'Your request has been queued on the server and will soon be ' +
         'processed.'
     ),
-    short_task: gettext(
+    short_task: () => gettext(
         'Your request arrived on the server but we still wait for it to be ' +
         'processed. If this takes longer than two minutes, please contact us or go ' +
         'back in your browser and try again.'
@@ -73,12 +74,12 @@ function async_task_check_callback(data, textStatus, jqXHR) {
 function async_task_update_status(data) {
     if (async_task_is_long) {
         if (data.started) {
-            waitingDialog.setStatus(async_task_status_messages.long_task_started);
+            waitingDialog.setStatus(async_task_status_messages.long_task_started());
         } else {
-            waitingDialog.setStatus(async_task_status_messages.long_task_pending);
+            waitingDialog.setStatus(async_task_status_messages.long_task_pending());
         }
     } else {
-        waitingDialog.setStatus(async_task_status_messages.short_task);
+        waitingDialog.setStatus(async_task_status_messages.short_task());
     }
 }