Added translation-check command

php artisan translation-check {LANG}
For example:
php artisan translation-check de

app/Console/Commands/CheckTranslations.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Console\Commands;
+
+use Illuminate\Console\Command;
+use Illuminate\Support\Facades\File;
+use Illuminate\Support\Arr;
+
+class CheckTranslations extends Command
+{
+    protected $signature = 'translation-check {language}';
+    protected $description = 'Check if translation files are up to date';
+
+    public function handle()
+    {
+        $defaultLanguage = 'en';
+        $languageCode = $this->argument('language');
+        $defaultTranslations = include base_path("resources/lang/{$defaultLanguage}/messages.php");
+        $translations = include base_path("resources/lang/{$languageCode}/messages.php");
+
+        $missingKeys = $this->getMissingKeys($defaultTranslations, $translations);
+
+        if (count($missingKeys) > 0) {
+            $this->output->error("{$languageCode} translation file is out of date!");
+            $this->output->table(['Missing Keys'], $missingKeys);
+            $this->output->error('Number of missing keys: ' . count($missingKeys));
+        } else {
+            $this->output->success("{$languageCode} translation file is up to date!");
+        }
+    }
+
+    protected function getMissingKeys(array $default, array $translations)
+    {
+        $missingKeys = [];
+
+        foreach (Arr::dot($default) as $key => $value) {
+            if (!Arr::has($translations, $key)) {
+                $missingKeys[] = [$key];
+            }
+        }
+
+        return $missingKeys;
+    }
+}