Update Spanish language files [skip ci]

resources/lang/es_ES/form.php

@@ -1,9 +1,8 @@
 <?php
-declare(strict_types=1);
 
 /**
  * form.php
- * Copyright (c) 2017 thegrumpydictator@gmail.com
+ * Copyright (c) 2018 thegrumpydictator@gmail.com
  *
  * This file is part of Firefly III.
  *
@@ -21,6 +20,8 @@ declare(strict_types=1);
  * along with Firefly III. If not, see <http://www.gnu.org/licenses/>.
  */
 
+declare(strict_types=1);
+
 return [
     // new user:
     'bank_name'                      => 'Banco',
@@ -184,6 +185,13 @@ return [
     'blocked'               => '¿Está bloqueado?',
     'blocked_code'          => 'Razón del bloqueo',
 
+    // import
+    'apply_rules'           => 'Apply rules',
+    'artist'                => 'Artist',
+    'album'                 => 'Album',
+    'song'                  => 'Song',
+
+
     // admin
     'domain'                => 'Dominio',
     'single_user_mode'      => 'Deshabilitar registro de usuario',