change asignment of args in global ts

frontend/src/global.ts

@@ -6,7 +6,7 @@ declare global {
 }
 
 String.prototype.format = function(...args: any[]): string {
-  args.flat();
+  args = args.flat(Infinity);
   return this.replace(/{(\d+)}/g, function(match, index) {
     return typeof args[index] == 'undefined' ? match : args[index];
   });