Form Translation (#616)

* Form Translation

* Support for other languages

* Support locale for datepicker

* Apply translation on select input

* Apply translation on select input

* Improve translation

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Co-authored-by: Julien Nahum <julien@nahum.net>

api/app/Models/Forms/Form.php

@@ -41,6 +41,8 @@ class Form extends Model implements CachableAttributes
 
     public const VISIBILITY = ['public', 'draft', 'closed'];
 
+    public const LANGUAGES = ['en', 'fr', 'hi', 'es', 'ar', 'zh', 'ja'];
+
     protected $fillable = [
         'workspace_id',
         'creator_id',
@@ -52,6 +54,7 @@ class Form extends Model implements CachableAttributes
         'visibility',
 
         // Customization
+        'language',
         'font_family',
         'custom_domain',
         'size',