Apply Cleanup and Refactor some models ...

Dtos/XResourceDto.cs

@@ -12,6 +12,6 @@ namespace xModels.Dtos
     public class XResourceDto : XBaseDto
     {
         public string Resource { get; set; }
-        public ICollection<XLocaleResourceDto> Locales { get; set; } = new HashSet<XLocaleResourceDto>();
+        public IEnumerable<XLocaleResourceDto> Locales { get; set; } = new HashSet<XLocaleResourceDto>();
     }
 }

Extensions/XModelExtensions.cs

@@ -1,4 +1,3 @@
-using System.Collections;
 using System.Collections.Generic;
 using System.Linq;
 using xCommons.Extensions;