removed unused usings

Author: YoussefSell

src/Countries/Domain/Entities/Language.cs

@@ -2,7 +2,6 @@
 {
     using System;
     using System.Collections.Generic;
-    using System.Globalization;
 
     /// <summary>
     /// this class defines a language

src/Countries/Services/CountriesService.cs

@@ -1,6 +1,5 @@
 namespace Countries
 {
-    using Data;
     using Domain.Entities;
     using Domain.Enums;
     using Domain.Exceptions;