Fix in API, added IsLocked field to nested schema.

src/Squidex/Areas/Api/Controllers/Schemas/Models/CreateSchemaNestedFieldDto.cs

@@ -23,6 +23,11 @@ namespace Squidex.Areas.Api.Controllers.Schemas.Models
         /// </summary>
         public bool IsHidden { get; set; }
 
+        /// <summary>
+        /// Defines if the field is locked.
+        /// </summary>
+        public bool IsLocked { get; set; }
+
         /// <summary>
         /// Defines if the field is disabled.
         /// </summary>