chore(translations): add Dutch files

frontend/src/i18n/locales.ts

@@ -4,6 +4,7 @@ import english from "./translations/en-US";
 import spanish from "./translations/es-ES";
 import finnish from "./translations/fi-FI";
 import french from "./translations/fr-FR";
+import dutch from "./translations/nl-BE";
 import portuguese from "./translations/pt-BR";
 import russian from "./translations/ru-RU";
 import serbian from "./translations/sr-SP";
@@ -66,4 +67,9 @@ export const LOCALES = {
     code: "sr-SP",
     messages: serbian,
   },
+  DUTCH: {
+    name: "Nederlands",
+    code: "nl-BE",
+    messages: dutch,
+  },
 };