Improve the error messages for batch processes

src/Cms/Files.php

@@ -113,7 +113,7 @@ public function delete(array $ids): void
 
 				if ($model instanceof File === false) {
 					throw new NotFoundException(
-						key: 'file.notFound'
+						key: 'file.undefined'
 					);
 				}
 
@@ -126,6 +126,7 @@ public function delete(array $ids): void
 		if ($exceptions !== []) {
 			throw new Exception(
 				key: 'file.delete.multiple',
+				details: $exceptions
 			);
 		}
 	}

src/Cms/Pages.php

@@ -138,7 +138,7 @@ public function delete(array $ids): void
 
 				if ($model instanceof Page === false) {
 					throw new NotFoundException(
-						key: 'page.notFound'
+						key: 'page.undefined',
 					);
 				}
 
@@ -151,6 +151,7 @@ public function delete(array $ids): void
 		if ($exceptions !== []) {
 			throw new Exception(
 				key: 'page.delete.multiple',
+				details: $exceptions
 			);
 		}
 	}

src/Exception/Exception.php

@@ -172,7 +172,18 @@ final public function getData(): array
 	 */
 	final public function getDetails(): array
 	{
-		return $this->details;
+		$details = $this->details;
+
+		foreach ($details as $key => $detail) {
+			if ($detail instanceof Throwable) {
+				$details[$key] = [
+					'label'   => $key,
+					'message' => $detail->getMessage(),
+				];
+			}
+		}
+
+		return $details;
 	}
 
 	/**