* Refactor and fix machine self-registration into db

+ Added change language API
+ Added Role to user info

Step.Database/Controllers/MachinesUsersController.cs

@@ -1,4 +1,5 @@
 using Step.Model.DatabaseModels;
+using Step.Model.DTOModels;
 using System;
 using System.Collections.Generic;
 using System.Linq;
@@ -22,15 +23,41 @@ namespace Step.Database.Controllers
             // Clear database context
             dbCtx.Dispose();
         }
-        
+
         public MachinesUsersModel FindByUserId(int machineId, int userId)
         {
             return dbCtx
                 .MachinesUsers
-                .Include("Role")
+                .Include("Role") // TODO Add machine and user info?
                 .Where(x => x.MachineId == machineId && x.UserId == userId)
                 .FirstOrDefault();
- 
+
+        }
+
+        public MachinesUsersModel Create(int machineId, int userId, int roleId)
+        {
+            MachinesUsersModel machine = new MachinesUsersModel() { MachineId = machineId, UserId = userId, RoleId = roleId };
+            dbCtx.MachinesUsers.Add(
+                machine
+            );
+            dbCtx.SaveChanges();
+
+            return machine;
+        }
+
+        public DTORoleModel GetUserRole(int machineId, int userId)
+        {
+            RoleModel role = dbCtx
+                .MachinesUsers
+                .Include("Role")
+                .Where(x => x.MachineId == machineId && x.UserId == userId)
+                .FirstOrDefault().Role;
+
+            return new DTORoleModel()
+            {
+                Id = role.RoleId,
+                Name = role.Name
+            };
         }
     }
 }