diff --git a/common/config/bootstrap.php b/common/config/bootstrap.php
index 64528ff..bce9d52 100644
--- a/common/config/bootstrap.php
+++ b/common/config/bootstrap.php
@@ -1,5 +1,4 @@
 <?php
 Yii::setAlias('common', dirname(__DIR__));
-Yii::setAlias('api', dirname(dirname(__DIR__)) . '/api');
-Yii::setAlias('console', dirname(dirname(__DIR__)) . '/console');
-Yii::setAlias('frontend', dirname(dirname(__DIR__)) . '/frontend');
+Yii::setAlias('api', dirname(__DIR__, 2) . '/api');
+Yii::setAlias('console', dirname(__DIR__, 2) . '/console');
diff --git a/common/validators/LanguageValidator.php b/common/validators/LanguageValidator.php
index 409e4a4..075eba1 100644
--- a/common/validators/LanguageValidator.php
+++ b/common/validators/LanguageValidator.php
@@ -1,39 +1,37 @@
 <?php
+declare(strict_types=1);
+
 namespace common\validators;
 
 use common\helpers\Error as E;
-use Yii;
+use Locale;
+use ResourceBundle;
 use yii\validators\Validator;
 
 class LanguageValidator extends Validator {
 
     public $message = E::UNSUPPORTED_LANGUAGE;
 
-    protected function validateValue($value) {
+    /**
+     * The idea of this validator belongs to
+     * https://github.com/lunetics/LocaleBundle/blob/1f5ee7f1802/Validator/LocaleValidator.php#L82-L88
+     *
+     * @param mixed $value
+     * @return array|null
+     */
+    protected function validateValue($value): ?array {
         if (empty($value)) {
             return null;
         }
 
-        $files = $this->getFilesNames();
-        if (in_array($value, $files)) {
-            return null;
+        $primary = Locale::getPrimaryLanguage($value);
+        $region = Locale::getRegion($value);
+        $locales = ResourceBundle::getLocales(''); // http://php.net/manual/ru/resourcebundle.locales.php#115965
+        if (($region !== '' && strtolower($primary) !== strtolower($region)) && !in_array($value, $locales)) {
+            return [$this->message, []];
         }
 
-        return [$this->message, []];
-    }
-
-    protected function getFilesNames() {
-        $files = array_values(array_filter(scandir($this->getFolderPath()), function(&$value) {
-            return $value !== '..' && $value !== '.';
-        }));
-
-        return array_map(function($value) {
-            return basename($value, '.json');
-        }, $files);
-    }
-
-    protected function getFolderPath() {
-        return Yii::getAlias('@frontend/src/i18n');
+        return null;
     }
 
 }
diff --git a/console/migrations/m180708_155425_extends_locale_field.php b/console/migrations/m180708_155425_extends_locale_field.php
new file mode 100644
index 0000000..600442b
--- /dev/null
+++ b/console/migrations/m180708_155425_extends_locale_field.php
@@ -0,0 +1,15 @@
+<?php
+
+use console\db\Migration;
+
+class m180708_155425_extends_locale_field extends Migration {
+
+    public function safeUp() {
+        $this->alterColumn('{{%accounts}}', 'lang', $this->string()->notNull()->defaultValue('en'));
+    }
+
+    public function safeDown() {
+        $this->alterColumn('{{%accounts}}', 'lang', $this->string(5)->notNull()->defaultValue('en'));
+    }
+
+}
diff --git a/tests/codeception/common/unit/fixtures/.gitkeep b/tests/codeception/common/unit/fixtures/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/tests/codeception/common/unit/fixtures/data/i18n/en.json b/tests/codeception/common/unit/fixtures/data/i18n/en.json
deleted file mode 100644
index cacf5c2..0000000
--- a/tests/codeception/common/unit/fixtures/data/i18n/en.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "testString": "testValue"
-}
diff --git a/tests/codeception/common/unit/fixtures/data/i18n/ru.json b/tests/codeception/common/unit/fixtures/data/i18n/ru.json
deleted file mode 100644
index 9734d39..0000000
--- a/tests/codeception/common/unit/fixtures/data/i18n/ru.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-    "testString": "тестовоеЗначение"
-}
diff --git a/tests/codeception/common/unit/validators/LanguageValidatorTest.php b/tests/codeception/common/unit/validators/LanguageValidatorTest.php
index e40e72c..e6d077e 100644
--- a/tests/codeception/common/unit/validators/LanguageValidatorTest.php
+++ b/tests/codeception/common/unit/validators/LanguageValidatorTest.php
@@ -1,39 +1,50 @@
 <?php
+declare(strict_types=1);
+
 namespace codeception\common\unit\validators;
 
-use Codeception\Specify;
 use common\validators\LanguageValidator;
-use tests\codeception\common\_support\ProtectedCaller;
 use tests\codeception\common\unit\TestCase;
 
+/**
+ * @covers \common\validators\LanguageValidator
+ */
 class LanguageValidatorTest extends TestCase {
-    use Specify;
-    use ProtectedCaller;
-
-    public function testGetFilesNames() {
-        $model = $this->createModelWithFixturePath();
-        $this->assertEquals(['en', 'ru'], $this->callProtected($model, 'getFilesNames'));
-    }
-
-    public function testValidateValueSupportedLanguage() {
-        $model = $this->createModelWithFixturePath();
-        $this->assertNull($this->callProtected($model, 'validateValue', 'ru'));
-    }
-
-    public function testValidateNotSupportedLanguage() {
-        $model = $this->createModelWithFixturePath();
-        $this->assertEquals([$model->message, []], $this->callProtected($model, 'validateValue', 'by'));
-    }
 
     /**
-     * @return LanguageValidator
+     * @param string $locale
+     * @param bool $shouldBeValid
+     *
+     * @dataProvider getTestCases
      */
-    private function createModelWithFixturePath() {
-        return new class extends LanguageValidator {
-            public function getFolderPath() {
-                return __DIR__ . '/../fixtures/data/i18n';
-            }
-        };
+    public function testValidate(string $locale, bool $shouldBeValid): void {
+        $validator = new LanguageValidator();
+        $result = $validator->validate($locale, $error);
+        $this->assertSame($shouldBeValid, $result, $locale);
+        if (!$shouldBeValid) {
+            $this->assertSame($validator->message, $error);
+        }
+    }
+
+    public function getTestCases(): array {
+        return [
+            // valid
+            ['de', true],
+            ['de_DE', true],
+            ['deu', true],
+            ['en', true],
+            ['en_US', true],
+            ['fil', true],
+            ['fil_PH', true],
+            ['zh', true],
+            ['zh_Hans_CN', true],
+            ['zh_Hant_HK', true],
+            // invalid
+            ['de_FR', false],
+            ['fr_US', false],
+            ['foo_bar', false],
+            ['foo_bar_baz', false],
+        ];
     }
 
 }