fix(framework): fix i18n bundle storage (#10924)

Fixes: #11497

Author: nnaydenow

packages/base/src/UI5Element.ts

@@ -1312,8 +1312,8 @@ abstract class UI5Element extends HTMLElement {
 			]);
 			const [i18nBundles] = result;
 			Object.entries(this.getMetadata().getI18n()).forEach((pair, index) => {
-				const propertyName = pair[0];
-				this.i18nBundleStorage[propertyName] = i18nBundles[index];
+				const bundleName = pair[1].bundleName;
+				this.i18nBundleStorage[bundleName] = i18nBundles[index];
 			});
 			this.asyncFinished = true;
 		};

packages/base/src/decorators/i18n.ts

@@ -23,7 +23,7 @@ const i18n = (bundleName: string): i18nDecorator => {
 
 		Object.defineProperty(target, propertyName, {
 			get() {
-				return target.i18nBundles[propertyName];
+				return target.i18nBundles[bundleName];
 			},
 			set() {},
 		});