diff --git a/Civi/RemoteTools/JsonSchema/Validation/Translation/CiviValidationTranslator.php b/Civi/RemoteTools/JsonSchema/Validation/Translation/CiviValidationTranslator.php
new file mode 100644
index 0000000..234d9bc
--- /dev/null
+++ b/Civi/RemoteTools/JsonSchema/Validation/Translation/CiviValidationTranslator.php
@@ -0,0 +1,54 @@
+<?php
+/*
+ * Copyright (C) 2023 SYSTOPIA GmbH
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU Affero General Public License as published by
+ *  the Free Software Foundation in version 3.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Affero General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Affero General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+declare(strict_types = 1);
+
+namespace Civi\RemoteTools\JsonSchema\Validation\Translation;
+
+use Opis\JsonSchema\Errors\ValidationError;
+use Systopia\JsonSchema\Translation\TranslatorFactory;
+use Systopia\JsonSchema\Translation\TranslatorInterface;
+
+/**
+ * @codeCoverageIgnore
+ */
+final class CiviValidationTranslator implements TranslatorInterface {
+
+  private string $lastLocale = '';
+
+  /**
+   * @phpstan-ignore-next-line Not initialized in constructor.
+   */
+  private TranslatorInterface $translator;
+
+  /**
+   * @inheritDoc
+   */
+  public function trans(string $id, array $parameters, ValidationError $error): string {
+    return $this->getTranslator()->trans($id, $parameters, $error);
+  }
+
+  private function getTranslator(): TranslatorInterface {
+    if (\CRM_Core_I18n::getLocale() !== $this->lastLocale) {
+      $this->lastLocale = \CRM_Core_I18n::getLocale();
+      $this->translator = TranslatorFactory::createTranslator($this->lastLocale);
+    }
+
+    return $this->translator;
+  }
+
+}
diff --git a/Civi/RemoteTools/JsonSchema/Validation/ValidationResult.php b/Civi/RemoteTools/JsonSchema/Validation/ValidationResult.php
index 8a7fb66..472900d 100644
--- a/Civi/RemoteTools/JsonSchema/Validation/ValidationResult.php
+++ b/Civi/RemoteTools/JsonSchema/Validation/ValidationResult.php
@@ -19,9 +19,11 @@
 
 namespace Civi\RemoteTools\JsonSchema\Validation;
 
-use Opis\JsonSchema\Errors\ErrorFormatter;
 use Opis\JsonSchema\Errors\ValidationError;
 use Systopia\JsonSchema\Errors\ErrorCollector;
+use Systopia\JsonSchema\Translation\ErrorTranslator;
+use Systopia\JsonSchema\Translation\NullTranslator;
+use Systopia\JsonSchema\Translation\TranslatorInterface;
 
 final class ValidationResult {
 
@@ -32,20 +34,16 @@ final class ValidationResult {
 
   private ErrorCollector $errorCollector;
 
-  private static function getErrorFormatter(): ErrorFormatter {
-    static $errorFormatter;
-    $errorFormatter ??= new ErrorFormatter();
-
-    return $errorFormatter;
-  }
+  private ErrorTranslator $errorTranslator;
 
   /**
    * @param array<string, mixed> $data
    * @param \Systopia\JsonSchema\Errors\ErrorCollector $errorCollector
    */
-  public function __construct(array $data, ErrorCollector $errorCollector) {
+  public function __construct(array $data, ErrorCollector $errorCollector, ?TranslatorInterface $translator = NULL) {
     $this->data = $data;
     $this->errorCollector = $errorCollector;
+    $this->errorTranslator = new ErrorTranslator($translator ?? new NullTranslator());
   }
 
   /**
@@ -59,14 +57,14 @@ public function getData(): array {
    * @return array<string, non-empty-array<string>>
    */
   public function getErrorMessages(): array {
-    return static::mapErrorsToMessages($this->errorCollector->getErrors());
+    return $this->mapErrorsToMessages($this->errorCollector->getErrors());
   }
 
   /**
    * @return array<string, non-empty-array<string>>
    */
   public function getLeafErrorMessages(): array {
-    return static::mapErrorsToMessages($this->errorCollector->getLeafErrors());
+    return $this->mapErrorsToMessages($this->errorCollector->getLeafErrors());
   }
 
   public function hasErrors(): bool {
@@ -82,11 +80,10 @@ public function isValid(): bool {
    *
    * @return array<string, non-empty-array<string>>
    */
-  private static function mapErrorsToMessages(array $errors): array {
-    $errorFormatter = static::getErrorFormatter();
+  private function mapErrorsToMessages(array $errors): array {
     return array_map(
       fn (array $errors): array => array_map(
-        fn (ValidationError $error): string => $errorFormatter->formatErrorMessage($error),
+        fn (ValidationError $error): string => $this->errorTranslator->trans($error),
         $errors
       ), $errors
     );
diff --git a/Civi/RemoteTools/JsonSchema/Validation/Validator.php b/Civi/RemoteTools/JsonSchema/Validation/Validator.php
index 226f16b..f543dc0 100644
--- a/Civi/RemoteTools/JsonSchema/Validation/Validator.php
+++ b/Civi/RemoteTools/JsonSchema/Validation/Validator.php
@@ -23,12 +23,16 @@
 use Civi\RemoteTools\Util\JsonConverter;
 use Opis\JsonSchema\Validator as OpisValidator;
 use Systopia\JsonSchema\Errors\ErrorCollector;
+use Systopia\JsonSchema\Translation\TranslatorInterface;
 
 final class Validator implements ValidatorInterface {
 
+  private TranslatorInterface $translator;
+
   private OpisValidator $validator;
 
-  public function __construct(OpisValidator $validator) {
+  public function __construct(TranslatorInterface $translator, OpisValidator $validator) {
+    $this->translator = $translator;
     $this->validator = $validator;
   }
 
@@ -48,7 +52,7 @@ public function validate(JsonSchema $jsonSchema, array $data, int $maxErrors = 1
       $this->validator->setMaxErrors($prevMaxErrors);
     }
 
-    return new ValidationResult(JsonConverter::toArray($validationData), $errorCollector);
+    return new ValidationResult(JsonConverter::toArray($validationData), $errorCollector, $this->translator);
   }
 
 }
diff --git a/composer.json b/composer.json
index 5e45bcd..4741e25 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "require": {
         "webmozart/assert": "^1",
         "systopia/expression-language-ext": "~0.1",
-        "systopia/opis-json-schema-ext": "~0.1",
+        "systopia/opis-json-schema-ext": "~0.2",
         "psr/log": "<3"
     },
     "scripts": {
diff --git a/services/json-forms.php b/services/json-forms.php
index b4234b7..36e717c 100644
--- a/services/json-forms.php
+++ b/services/json-forms.php
@@ -30,14 +30,18 @@
 use Civi\RemoteTools\JsonSchema\FormSpec\JsonSchemaFactory;
 use Civi\RemoteTools\JsonSchema\FormSpec\JsonSchemaFactoryInterface;
 use Civi\RemoteTools\JsonSchema\Validation\OpisValidatorFactory;
+use Civi\RemoteTools\JsonSchema\Validation\Translation\CiviValidationTranslator;
 use Civi\RemoteTools\JsonSchema\Validation\Validator;
 use Civi\RemoteTools\JsonSchema\Validation\ValidatorInterface;
 use Opis\JsonSchema\Validator as OpisValidator;
 use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
+use Systopia\JsonSchema\Translation\TranslatorInterface;
 
 $container->register(OpisValidator::class)->setFactory([OpisValidatorFactory::class, 'getValidator']);
 $container->autowire(ValidatorInterface::class, Validator::class);
 
+$container->autowire(TranslatorInterface::class, CiviValidationTranslator::class);
+
 $container->autowire(JsonSchemaFactoryInterface::class, JsonSchemaFactory::class)
   ->addArgument(new TaggedIteratorArgument(
     FieldJsonSchemaFactoryInterface::SERVICE_TAG,