Feature/improve message for data provider errors (#1003)

* Add title

* Update changelog

CHANGELOG.md

@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Changed
 
+- Improved the message for data provider errors in the client
 - Changed the label from _Balance_ to _Cash Balance_ in the account dialog
 
 ## 1.157.0 - 11.06.2022

apps/client/src/app/components/portfolio-performance/portfolio-performance.component.ts

@@ -81,9 +81,11 @@ export class PortfolioPerformanceComponent implements OnChanges, OnInit {
   }
 
   public onShowErrors() {
-    const errorMessageParts = this.errors.map((error) => {
-      return `${error.symbol} (${error.dataSource})`;
-    });
+    const errorMessageParts = ['Data Provider Errors for'];
+
+    for (const error of this.errors) {
+      errorMessageParts.push(`${error.symbol} (${error.dataSource})`);
+    }
 
     alert(errorMessageParts.join('\n'));
   }