fix: encode URI parameter to proxy URI

Closes #326

src/app/modules/hebis/daia-data.provider.ts

@@ -206,7 +206,7 @@ export class DaiaDataProvider {
       return resourceLink;
     }
 
-    return `${this.hebisProxyUrl}${resourceLink}`;
+    return `${this.hebisProxyUrl}${encodeURIComponent(resourceLink)}`;
   }
 
   holdingHasStatus(available: DaiaService[]): boolean {