diff --git a/.github/workflows/phpunit.yml b/.github/workflows/phpunit.yml
index 3f82748..e280aad 100644
--- a/.github/workflows/phpunit.yml
+++ b/.github/workflows/phpunit.yml
@@ -29,4 +29,6 @@ jobs:
                 run: composer require symfony/console:^${{ matrix.symfony }} symfony/finder:^${{ matrix.symfony }}
 
             -   name: Execute tests
-                run: sudo vendor/bin/phpunit --colors=always
+                run: |
+                    sudo vendor/bin/phpunit --colors=always --exclude-group Translate
+                    sudo vendor/bin/phpunit --colors=always --group Translate
diff --git a/src/Commands/Translate.php b/src/Commands/Translate.php
index e07c49a..70b1b55 100644
--- a/src/Commands/Translate.php
+++ b/src/Commands/Translate.php
@@ -5,7 +5,9 @@
 namespace LaravelLang\StatusGenerator\Commands;
 
 use LaravelLang\StatusGenerator\Constants\Command as CommandName;
+use LaravelLang\StatusGenerator\Constants\Option;
 use LaravelLang\StatusGenerator\Processors\Translate\Translate as TranslateProcessor;
+use Symfony\Component\Console\Input\InputOption;
 
 class Translate extends Command
 {
@@ -17,6 +19,12 @@ protected function configure(): Command
     {
         return parent::configure()
             ->setName(CommandName::TRANSLATE())
-            ->setDescription('Translation of untranslated keys');
+            ->setDescription('Translation of untranslated keys')
+            ->addOption(
+                Option::LOCALE(),
+                null,
+                InputOption::VALUE_OPTIONAL,
+                'Translation of values only for the selected localization. By default, translation of all localizations'
+            );
     }
 }
diff --git a/src/Concerns/Parameters.php b/src/Concerns/Parameters.php
index 5221ca3..ead5974 100644
--- a/src/Concerns/Parameters.php
+++ b/src/Concerns/Parameters.php
@@ -3,6 +3,7 @@
 namespace LaravelLang\StatusGenerator\Concerns;
 
 use DragonCode\Support\Facades\Helpers\Arr;
+use DragonCode\Support\Facades\Helpers\Str;
 use LaravelLang\StatusGenerator\Constants\Option;
 
 /** @mixin \LaravelLang\StatusGenerator\Processors\Processor */
@@ -30,7 +31,7 @@ protected function getFileParameter(): ?string
 
     protected function getLocaleParameter(): ?string
     {
-        return $this->parameter(Option::LOCALE());
+        return Str::replace($this->parameter(Option::LOCALE()), '-', '_');
     }
 
     protected function getProjectParameter(): ?string
diff --git a/src/Processors/Create/CreateLocale.php b/src/Processors/Create/CreateLocale.php
index eca69f0..a8e8330 100644
--- a/src/Processors/Create/CreateLocale.php
+++ b/src/Processors/Create/CreateLocale.php
@@ -4,7 +4,6 @@
 
 use DragonCode\Support\Facades\Filesystem\Directory;
 use DragonCode\Support\Facades\Filesystem\File;
-use DragonCode\Support\Facades\Helpers\Str;
 use Exception;
 use LaravelLang\StatusGenerator\Processors\Processor;
 
@@ -27,7 +26,7 @@ protected function copy(): void
             $this->output->task($filename, function () use ($filename) {
                 File::copy(
                     $this->makePath($filename, $this->default_locale),
-                    $this->makePath($filename, $this->getLocale())
+                    $this->makePath($filename, $this->getLocaleParameter())
                 );
             });
         }
@@ -40,12 +39,7 @@ protected function sourceFiles(): array
 
     protected function exists(): bool
     {
-        return Directory::exists($this->getLocalesPath($this->getLocale()));
-    }
-
-    protected function getLocale(): string
-    {
-        return Str::replace($this->getLocaleParameter(), '-', '_');
+        return Directory::exists($this->getLocalesPath($this->getLocaleParameter()));
     }
 
     protected function makePath(string $filename, string $locale): string
diff --git a/src/Processors/Translate/Translate.php b/src/Processors/Translate/Translate.php
index a883482..f5972c1 100644
--- a/src/Processors/Translate/Translate.php
+++ b/src/Processors/Translate/Translate.php
@@ -15,8 +15,8 @@ public function handle(): void
     {
         $source = $this->locales()->getSource();
 
-        foreach ($this->directories() as $locale) {
-            $this->output->task($locale . ' translation', function () use ($locale, $source) {
+        foreach ($this->getLocales() as $locale) {
+            $this->output->task($locale, function () use ($locale, $source) {
                 $locales  = $this->locales()->getLocale($locale);
                 $excludes = $this->locales()->getExcludes($locale);
 
@@ -78,6 +78,15 @@ protected function isSameValue(array $source, int|string $key, string $value): b
 
     protected function doesntExclude(array $excludes, string $value): bool
     {
-        return ! in_array($value, $excludes, true);
+        return ! in_array($value, $excludes);
+    }
+
+    protected function getLocales(): array
+    {
+        if ($locale = $this->getLocaleParameter()) {
+            return Arr::filter($this->directories(), fn (string $dir) => $dir === $locale);
+        }
+
+        return $this->directories();
     }
 }
diff --git a/tests/Concerns/Commands.php b/tests/Concerns/Commands.php
index 163153c..ae296c3 100644
--- a/tests/Concerns/Commands.php
+++ b/tests/Concerns/Commands.php
@@ -11,6 +11,8 @@ trait Commands
 {
     protected ?CommandName $call = null;
 
+    protected array $call_options = [];
+
     protected int $call_tries = 1;
 
     protected function command(CommandName $name, array $options = []): void
@@ -22,7 +24,7 @@ protected function runCommand(): void
     {
         if ($name = $this->call) {
             for ($i = 0; $i < $this->call_tries; ++$i) {
-                $this->command($name);
+                $this->command($name, $this->call_options);
             }
         }
     }
diff --git a/tests/Fixtures/Resources/Translate/locales/fr/_excludes.json b/tests/Fixtures/Resources/Translate/locales/fr/_excludes.json
new file mode 100644
index 0000000..611048f
--- /dev/null
+++ b/tests/Fixtures/Resources/Translate/locales/fr/_excludes.json
@@ -0,0 +1,5 @@
+[
+    "Administrator",
+    "This field must be accepted.",
+    "The :attribute must be accepted."
+]
diff --git a/tests/Fixtures/Resources/Translate/locales/fr/json.json b/tests/Fixtures/Resources/Translate/locales/fr/json.json
new file mode 100644
index 0000000..4fccfdb
--- /dev/null
+++ b/tests/Fixtures/Resources/Translate/locales/fr/json.json
@@ -0,0 +1,6 @@
+{
+    "Added.": "Added.",
+    "Administrator": "Administrator",
+    "Foo": "Foo",
+    "Bar.": "Bar."
+}
diff --git a/tests/Fixtures/Resources/Translate/locales/fr/php-inline.json b/tests/Fixtures/Resources/Translate/locales/fr/php-inline.json
new file mode 100644
index 0000000..50e21f7
--- /dev/null
+++ b/tests/Fixtures/Resources/Translate/locales/fr/php-inline.json
@@ -0,0 +1,7 @@
+{
+    "accepted": "This field must be accepted.",
+    "accepted_if": "This field must be accepted when :other is :value.",
+    "active_url": "This field is not a valid URL.",
+    "custom2": "Custom field 2",
+    "sub.array2": "Sub Array 2"
+}
diff --git a/tests/Fixtures/Resources/Translate/locales/fr/php.json b/tests/Fixtures/Resources/Translate/locales/fr/php.json
new file mode 100644
index 0000000..0fcd351
--- /dev/null
+++ b/tests/Fixtures/Resources/Translate/locales/fr/php.json
@@ -0,0 +1,10 @@
+{
+    "0": "Numeric Zero",
+    "10": "Numeric Ten",
+    "100": "Numeric One Hundred",
+    "accepted": "The :attribute must be accepted.",
+    "accepted_if": "The :attribute must be accepted when :other is :value.",
+    "active_url": "The :attribute is not a valid URL.",
+    "custom": "Custom field",
+    "sub.array": "Sub Array"
+}
diff --git a/tests/Unit/Commands/Translate/EnglishTest.php b/tests/Unit/Commands/Translate/EnglishTest.php
index 15a6079..5bbeb5b 100644
--- a/tests/Unit/Commands/Translate/EnglishTest.php
+++ b/tests/Unit/Commands/Translate/EnglishTest.php
@@ -4,6 +4,9 @@
 
 namespace Tests\Unit\Commands\Translate;
 
+/**
+ * @group Translate
+ */
 class EnglishTest extends Base
 {
     public function testJson(): void
diff --git a/tests/Unit/Commands/Translate/FrenchTest.php b/tests/Unit/Commands/Translate/FrenchTest.php
new file mode 100644
index 0000000..e6439a1
--- /dev/null
+++ b/tests/Unit/Commands/Translate/FrenchTest.php
@@ -0,0 +1,56 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Commands\Translate;
+
+/**
+ * @group Translate
+ */
+class FrenchTest extends Base
+{
+    public function testJson(): void
+    {
+        $this->assertJsonFileEqualsJson([
+            'Added.'        => 'Ajoutée.',
+            'Administrator' => 'Administrator',
+        ], 'locales/fr/json.json', __FUNCTION__);
+    }
+
+    public function testPhp(): void
+    {
+        $values = $this->filesystem->load($this->tempPath('locales/fr/php.json'));
+
+        $this->assertContainsEquals($values[0], ['Zéro numérique']);
+        $this->assertContainsEquals($values[10], ['Dix numériques']);
+        $this->assertContainsEquals($values[100], ['Cent numérique']);
+
+        $this->assertSame($values['accepted'], 'The :attribute must be accepted.');
+
+        $this->assertContainsEquals($values['accepted_if'], ['Le :attribute doit être accepté quand :other vaut :value.']);
+
+        $this->assertContainsEquals($values['active_url'], ['Le :attribute n\'est pas une URL valide.']);
+
+        $this->assertContainsEquals($values['between.array'], ['The :attribute must have between :min and :max items.']);
+        $this->assertContainsEquals($values['between.file'], ['The :attribute must be between :min and :max kilobytes.']);
+    }
+
+    public function testPhpInline(): void
+    {
+        $values = $this->filesystem->load($this->tempPath('locales/fr/php-inline.json'));
+
+        $this->assertSame($values['accepted'], 'This field must be accepted.');
+
+        $this->assertContainsEquals($values['accepted_if'], ['Ce champ doit être accepté lorsque :other vaut :value.']);
+
+        $this->assertContainsEquals($values['active_url'], ['Ce champ n\'est pas une URL valide.']);
+
+        $this->assertContainsEquals($values['between.array'], ['This field must have between :min and :max items.']);
+        $this->assertContainsEquals($values['between.file'], ['This field must be between :min and :max kilobytes.']);
+    }
+
+    public function testExcludes(): void
+    {
+        $this->assertFileExists($this->tempPath('locales/fr/_excludes.json'));
+    }
+}
diff --git a/tests/Unit/Commands/Translate/GermanTest.php b/tests/Unit/Commands/Translate/GermanTest.php
index 7db6c08..79572c4 100644
--- a/tests/Unit/Commands/Translate/GermanTest.php
+++ b/tests/Unit/Commands/Translate/GermanTest.php
@@ -4,6 +4,9 @@
 
 namespace Tests\Unit\Commands\Translate;
 
+/**
+ * @group Translate
+ */
 class GermanTest extends Base
 {
     public function testJson(): void
diff --git a/tests/Unit/Commands/Translate/PerLocaleTest.php b/tests/Unit/Commands/Translate/PerLocaleTest.php
new file mode 100644
index 0000000..f8e1318
--- /dev/null
+++ b/tests/Unit/Commands/Translate/PerLocaleTest.php
@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Unit\Commands\Translate;
+
+/**
+ * @group Translate
+ */
+class PerLocaleTest extends Base
+{
+    protected array $call_options = [
+        '--locale' => 'de',
+    ];
+
+    public function testJson(): void
+    {
+        $this->assertJsonFileEqualsJson([
+            'Added.'        => 'Hinzugefügt.',
+            'Administrator' => 'Administrator',
+        ], 'locales/de/json.json', __FUNCTION__);
+
+        $this->assertJsonFileEqualsJson([
+            'Added.'        => 'Added.',
+            'Administrator' => 'Administrator',
+            'Foo'           => 'Foo',
+            'Bar.'          => 'Bar.',
+        ], 'locales/fr/json.json', __FUNCTION__);
+    }
+
+    public function testPhp(): void
+    {
+        // German
+        $values = $this->filesystem->load($this->tempPath('locales/de/php.json'));
+
+        $this->assertContainsEquals($values[0], ['Numerische Null']);
+        $this->assertContainsEquals($values[10], ['Numerische Zehn']);
+        $this->assertContainsEquals($values[100], ['Numerisch Hundert']);
+
+        // French
+        $values = $this->filesystem->load($this->tempPath('locales/fr/php.json'));
+
+        $this->assertContainsEquals($values[0], ['Numeric Zero']);
+        $this->assertContainsEquals($values[10], ['Numeric Ten']);
+        $this->assertContainsEquals($values[100], ['Numeric One Hundred']);
+    }
+
+    public function testPhpInline(): void
+    {
+        // German
+        $values = $this->filesystem->load($this->tempPath('locales/de/php-inline.json'));
+
+        $this->assertContainsEquals(
+            $values['accepted_if'],
+            ['Dieses Feld muss akzeptiert werden, wenn :other gleich :value ist.', 'Dieses Feld muss akzeptiert werden, wenn :other :value ist.']
+        );
+
+        $this->assertContainsEquals($values['active_url'], ['Dieses Feld ist keine gültige URL.', 'Das ist keine gültige Internet-Adresse.']);
+
+        // French
+        $values = $this->filesystem->load($this->tempPath('locales/fr/php-inline.json'));
+
+        $this->assertSame($values['accepted_if'], 'This field must be accepted when :other is :value.');
+        $this->assertSame($values['active_url'], 'This field is not a valid URL.');
+    }
+}