There will likely not be a localized version of GrandPerspective 0.9.12. The reason is that I have not received any updated localizations. The fairly high release rate of GrandPerspective may have been wearing existing localizers out a bit. To give them some well-earned rest, I have not actively chased them for a change. I am instead now aiming for a localized Version 1.00 of GrandPerspective in as many languages as possible. See http://grandperspectiv.sourceforge.net/localization.html#version1_00 for details. Volunteers are welcome!
Of course, should I still receive localizations for Version 0.9.12, or if anyone is interested in a localized release of GrandPerspective with only the Dutch language (laat het mij dan weten via http://sourceforge.net/forum/forum.php?forum_id=634668 ), a localized release of GrandPerspective 0.9.12 may still appear.