fixed assignment save bug

Management.Web/Shared/Module/NewAssignment.razor

@@ -33,16 +33,17 @@
 
     if(planner.LocalCourse != null)
     {
+      var newModules =planner.LocalCourse.Modules.Select(m => 
+        m.Name != Module.Name 
+          ? m 
+          : Module with 
+          {
+            Assignments=Module.Assignments.Append(newAssignment)
+          }
+        );
       planner.LocalCourse = planner.LocalCourse with 
       {
-        Modules=planner.LocalCourse.Modules.Select(m => 
-          m.Name != Module.Name 
-            ? m 
-            : Module with 
-            {
-              Assignments=Module.Assignments.Append(newAssignment)
-            }
-          )
+        Modules=newModules
       };
     }
     modal?.Hide();
@@ -52,7 +53,7 @@
   class="btn btn-outline-secondary" 
   @onclick="() => modal?.Show()"
 >
-  New Assignment
+  + Assignment
 </button>
 
 <Modal @ref="modal">
@@ -69,7 +70,7 @@
       class="btn btn-primary"
       @onclick="submitHandler"
     >
-      Save changes
+      Create Assignment
     </button>
   </Footer>
 </Modal>