Add credits to the Spanish translator

I've used SPCode for a while now and I didn't see any credit given to the Spanish version.
Just pointing out that this guy is missing in the about window, that's all :P

Author: punteroo

UI/Windows/AboutWindow.xaml

@@ -68,6 +68,7 @@
                         <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- JOMENVEST (Swedish translation)" />
                         <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- Grey83 (Russian translation)" />
                         <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- Ghost Rideaux (Portuguese translation)" />
+                        <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- ratawar (Spanish translation)" />
                         <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- Trostal (Korean translation)" />
                         <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- Johnny2525 (Korean translation)" />
                         <TextBlock HorizontalAlignment="Left" VerticalAlignment="Top" Text="- Mithat Güner (Turkish translation)" />