Translation: Log a warning for any unknown lang keys

Based on https://laravel.com/docs/10.x/localization#handling-missing-translation-strings.

Use "resolving" callback instead of using the Log facade / the 'log'
service because if we do that it will force the deferred
LogServiceProvider to be registered on every request, essentially
making it not deferred any more.

Similar to how Model::shouldBeStrict() is only called when not
in production, we only throw an exception when not in production.

app/Providers/AppServiceProvider.php

@@ -5,7 +5,10 @@
 namespace App\Providers;
 
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Support\Facades\Log;
 use Illuminate\Support\ServiceProvider;
+use Illuminate\Translation\Translator;
+use OutOfBoundsException;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -14,7 +17,19 @@ class AppServiceProvider extends ServiceProvider
      */
     public function register(): void
     {
-        //
+        $this->app->resolving('translator', static function (Translator $translator): void {
+            $translator->handleMissingKeysUsing(static function (string $key): string {
+                $message = "Missing translation key [{$key}] detected.";
+
+                if (!$this->isProduction()) {
+                    throw new OutOfBoundsException($message);
+                }
+
+                Log::warning($message);
+
+                return $key;
+            });
+        });
     }
 
     /**