fix front end i18n can't be updated

fix bs-community/blessing-skin-plugins#74

app/Listeners/CleanUpFrontEndLocaleFiles.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Listeners;
+
+use Illuminate\Filesystem\Filesystem;
+use Symfony\Component\Finder\SplFileInfo;
+
+class CleanUpFrontEndLocaleFiles
+{
+    /** @var Filesystem */
+    protected $filesystem;
+
+    public function __construct(Filesystem $filesystem)
+    {
+        $this->filesystem = $filesystem;
+    }
+
+    public function handle()
+    {
+        $files = $this->filesystem->allFiles(public_path('lang'));
+        array_walk($files, function (SplFileInfo $file) {
+            if ($file->getExtension() === 'js') {
+                $this->filesystem->delete($file->getPathname());
+            }
+        });
+    }
+}

app/Providers/EventServiceProvider.php

@@ -11,9 +11,11 @@ class EventServiceProvider extends ServiceProvider
     protected $listen = [
         'App\Events\PluginWasEnabled' => [
             Listeners\CopyPluginAssets::class,
+            Listeners\CleanUpFrontEndLocaleFiles::class,
         ],
         'plugin.versionChanged' => [
             Listeners\CopyPluginAssets::class,
+            Listeners\CleanUpFrontEndLocaleFiles::class,
         ],
         'App\Events\PluginBootFailed' => [
             Listeners\NotifyFailedPlugin::class,

tests/ListenersTest/CleanUpFrontEndLocaleFilesTest.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace Tests;
+
+use Symfony\Component\Finder\SplFileInfo;
+
+class CleanUpFrontEndLocaleFilesTest extends TestCase
+{
+    public function testHandle()
+    {
+        $plugin = new \App\Services\Plugin('/path', ['name' => 'fake']);
+
+        $this->partialMock(\Illuminate\Filesystem\Filesystem::class, function ($mock) {
+            $dir = public_path('lang');
+            $path = public_path('lang/en.js');
+            $mock->shouldReceive('allFiles')
+                ->with($dir)
+                ->once()
+                ->andReturn([new SplFileInfo(public_path('lang/en.js'), 'en.js', 'en.js')]);
+            $mock->shouldReceive('delete')
+                ->with($path)
+                ->once();
+        });
+
+        event('plugin.versionChanged', [$plugin]);
+    }
+}

tests/ListenersTest/CopyPluginAssetsTest.php

@@ -8,7 +8,7 @@ class CopyPluginAssetsTest extends TestCase
     {
         $plugin = new \App\Services\Plugin('/path', ['name' => 'fake']);
 
-        $this->mock(\Illuminate\Filesystem\Filesystem::class, function ($mock) {
+        $this->partialMock(\Illuminate\Filesystem\Filesystem::class, function ($mock) {
             $dir = public_path('plugins/fake');
             $mock->shouldReceive('deleteDirectory')
                 ->with($dir)