Feature: add Vietnamese translation (#10352)

src-ui/src/app/services/settings.service.ts

@@ -244,6 +244,12 @@ const LANGUAGE_OPTIONS = [
     englishName: 'Ukrainian',
     dateInputFormat: 'dd.mm.yyyy',
   },
+  {
+    code: 'vi-vn',
+    name: $localize`Vietnamese`,
+    englishName: 'Vietnamese',
+    dateInputFormat: 'dd/mm/yyyy',
+  },
   {
     code: 'zh-cn',
     name: $localize`Chinese Simplified`,