diff --git a/Classes/Form/Decorator/AbstractFormDefinitionDecorator.php b/Classes/Form/Decorator/AbstractFormDefinitionDecorator.php
index a7985dbd..8b99dac8 100644
--- a/Classes/Form/Decorator/AbstractFormDefinitionDecorator.php
+++ b/Classes/Form/Decorator/AbstractFormDefinitionDecorator.php
@@ -11,7 +11,6 @@
 
 namespace FriendsOfTYPO3\Headless\Form\Decorator;
 
-use function count;
 use function in_array;
 
 abstract class AbstractFormDefinitionDecorator implements DefinitionDecoratorInterface
@@ -55,8 +54,8 @@ protected function handleRenderables(array $renderables): array
     {
         foreach ($renderables as &$element) {
             if (in_array($element['type'], ['Fieldset', 'GridRow'], true) &&
-                is_array($element['renderables']) &&
-                count($element['renderables'])) {
+                is_array($element['renderables'] ?? []) &&
+                ($element['renderables'] ?? []) !== []) {
                 $element['elements'] = $this->handleRenderables($element['renderables']);
                 unset($element['renderables']);
             } else {
diff --git a/Classes/Form/Translator.php b/Classes/Form/Translator.php
index 54f58f04..2373992e 100644
--- a/Classes/Form/Translator.php
+++ b/Classes/Form/Translator.php
@@ -73,17 +73,22 @@ public function translate(array $formDefinition, array $renderingOptions, array
      */
     private function translateRenderables(array $renderables, array $formRuntime, array $sentValues): array
     {
-        foreach ($renderables as &$element) {
+        $translated = [];
+
+        foreach ($renderables as $element) {
             $properties = [];
 
             if (isset($element['renderables']) && is_array($element['renderables'])) {
                 $element['renderables'] = $this->translateRenderables($element['renderables'], $formRuntime, $sentValues);
             }
 
+            $validators = [];
+
             if (isset($element['validators']) &&
                 is_array($element['validators'])) {
-                foreach ($element['validators'] as &$validator) {
+                foreach ($element['validators'] as $validator) {
                     if (!isset($validator['errorMessage'])) {
+                        $validators[] = $validator;
                         continue;
                     }
 
@@ -93,7 +98,11 @@ private function translateRenderables(array $renderables, array $formRuntime, ar
                         $formRuntime,
                         is_array($validator['options'] ?? null) ? $validator['options'] : []
                     );
+
+                    $validators[] = $validator;
                 }
+
+                $element['validators'] = $validators;
             }
 
             if (isset($element['properties']) && is_array($element['properties'])) {
@@ -118,6 +127,7 @@ private function translateRenderables(array $renderables, array $formRuntime, ar
                             $error['code'],
                             $formRuntime
                         ),
+                        'customMessage' => $error['message'],
                     ];
                 }
             }
@@ -137,8 +147,10 @@ private function translateRenderables(array $renderables, array $formRuntime, ar
             $element['defaultValue'] = $translatedDefaultValue !== '' && $translatedDefaultValue !== null ? $translatedDefaultValue : ($element['defaultValue'] ?? '');
             $element['value'] = $sentValues[$element['identifier']] ?? null;
             $element['properties'] = $properties;
+
+            $translated[] = $element;
         }
 
-        return $renderables;
+        return $translated;
     }
 }
diff --git a/Tests/Unit/Form/TranslatorTest.php b/Tests/Unit/Form/TranslatorTest.php
index f533d20a..9d014a0a 100644
--- a/Tests/Unit/Form/TranslatorTest.php
+++ b/Tests/Unit/Form/TranslatorTest.php
@@ -46,7 +46,7 @@ public function test(): void
                                 'properties' => [
                                     'validationErrorMessages' => [
                                         ['code' => 111, 'message' => 'translateMe'],
-                                    ]
+                                    ],
                                 ],
                                 'value' => null,
                             ],
@@ -81,7 +81,7 @@ public function test(): void
                                         'identifier' => 'RegularExpression',
                                         'options' => ['regularExpression' => '/a-b/'],
                                         'FERegularExpression' => '/a-z/',
-                                    ]
+                                    ],
                                 ],
                                 'value' => null,
                             ],
@@ -99,8 +99,8 @@ public function test(): void
                                 'label' => 'Upload image',
                                 'properties' => ['saveToFileMount' => '/upload-dir'],
                                 'value' => null,
-                            ]
-                        ]
+                            ],
+                        ],
                     ],
                 1 => [],
             ],
@@ -126,9 +126,9 @@ public function test(): void
                                 'identifier' => 'testfield',
                                 'label' => 'translatedValue',
                                 'properties' => [
-                                        'validationErrorMessages' => [
-                                            ['code' => 111, 'message' => 'translatedError'],
-                                        ]
+                                    'validationErrorMessages' => [
+                                        ['code' => 111, 'message' => 'translatedError', 'customMessage' => 'translateMe'],
+                                    ],
                                 ],
                                 'value' => null,
                                 'defaultValue' => 'translatedValue',
@@ -167,7 +167,7 @@ public function test(): void
                                         'identifier' => 'RegularExpression',
                                         'options' => ['regularExpression' => '/a-b/'],
                                         'FERegularExpression' => '/a-z/',
-                                    ]
+                                    ],
                                 ],
                                 'value' => null,
                                 'defaultValue' => 'translatedValue',
@@ -188,12 +188,12 @@ public function test(): void
                                 'properties' => ['saveToFileMount' => 'translatedValue'],
                                 'value' => null,
                                 'defaultValue' => 'translatedValue',
-                            ]
+                            ],
                         ],
                         'label' => 'translatedValue',
 
                     ],
-            ]
+            ],
         ], $translator->translate($formDefinition, []));
     }
 }