Add Vietnamese to UI culture (#20061)

* add vietnamsese to ui culture

* update vietnamese

* update vietnamese

* add vietnamese

* Update src/Umbraco.Web.UI.Client/src/assets/lang/vi.ts

Co-authored-by: Andy Butland <abutland73@gmail.com>

---------

Co-authored-by: Lan Nguyen Thuy <lnt@umbraco.dk>
Co-authored-by: Andy Butland <abutland73@gmail.com>

src/Umbraco.Web.UI.Client/src/assets/lang/en.ts

@@ -2865,5 +2865,6 @@ export default {
 		uk: 'Українська',
 		zh: '中文',
 		'zh-tw': '中文（正體，台灣）',
+		vi: 'Tiếng Việt',
 	},
 } as UmbLocalizationDictionary;

src/Umbraco.Web.UI.Client/src/packages/core/localization/manifests.ts

@@ -271,4 +271,14 @@ export const manifests: Array<ManifestLocalization> = [
 		},
 		js: () => import('../../../assets/lang/zh-tw.js'),
 	},
+	{
+		type: 'localization',
+		alias: 'Umb.Localization.VI',
+		weight: 100,
+		name: 'Vietnamese Backoffice UI Localization',
+		meta: {
+			culture: 'vi',
+		},
+		js: () => import('../../../assets/lang/vi.js'),
+	},
 ];