Aircraft Controller refactor and localization

models/Aircraft.php

@@ -24,7 +24,12 @@ class Aircraft extends Model
   /**
    * @var array Validation rules
    */
-  public $rules = [];
+  public $rules = [
+    'aircraft_type' => 'required',
+    'registration' => 'required',
+    'name' => 'required',
+    'home_airport_id' => 'required',
+  ];
 
   public $belongsTo = [
     'aircraft_type' => 'GermanAirlinesVa\Fleet\Models\AircraftType',