[csharp/pt-br] Missing translation

pt-br/csharp-pt.html.markdown

@@ -834,7 +834,7 @@ on a new line! ""Wow!"", the masses cried";
         bool Broken { get; } // interfaces can contain properties as well as methods & events
     }
 
-    // Class can inherit only one other class, but can implement any amount of interfaces
+    // Classes podem herdar apenas de uma outra classe, mas podem implementar qualquer quantidade de interfaces.
     class MountainBike : Bicycle, IJumpable, IBreakable
     {
         int damage = 0;