no need to copy lang files

app/Listeners/CopyPluginAssets.php

@@ -7,9 +7,7 @@ use Illuminate\Filesystem\Filesystem;
 
 class CopyPluginAssets
 {
-    /**
-     * @var Filesystem
-     */
+    /** @var Filesystem */
     protected $filesystem;
 
     public function __construct(Filesystem $filesystem)
@@ -27,9 +25,5 @@ class CopyPluginAssets
             $plugin->getPath().DIRECTORY_SEPARATOR.'assets',
             $dir.'/assets'
         );
-        $this->filesystem->copyDirectory(
-            $plugin->getPath().DIRECTORY_SEPARATOR.'lang',
-            $dir.'/lang'
-        );
     }
 }

tests/ListenersTest/CopyPluginAssetsTest.php

@@ -13,14 +13,9 @@ class CopyPluginAssetsTest extends TestCase
             $mock->shouldReceive('deleteDirectory')
                 ->with($dir)
                 ->once();
-
             $mock->shouldReceive('copyDirectory')
                 ->withArgs(['/path'.DIRECTORY_SEPARATOR.'assets', $dir.'/assets'])
                 ->once();
-
-            $mock->shouldReceive('copyDirectory')
-                ->withArgs(['/path'.DIRECTORY_SEPARATOR.'lang', $dir.'/lang'])
-                ->once();
         });
 
         event('plugin.versionChanged', [$plugin]);