Fix backend error handler

Signed-off-by: Dobes Vandermeer <dobes.vandermeer@newsela.com>

Author: dobesv

ui/src/app/actions/utils.ts

@@ -93,8 +93,8 @@ export async function fetchApi<T>(path: string, options: ApiOptions = {}): Promi
  * @param defaultMessage Default error message if the error doesn't have a message
  * @returns A BaseResponse object with error information
  */
-export function createErrorResponse<T>(error: unknown, defaultMessage: string): { message: string; data?: T } {
+export function createErrorResponse<T>(error: unknown, defaultMessage: string): { message: string; error: string; data?: T } {
   const errorMessage = error instanceof Error ? error.message : defaultMessage;
   console.error(defaultMessage, error);
-  return { message: errorMessage };
+  return { message: errorMessage, error: errorMessage };
 }