Bug 514482 - Find a better name for the Linux default theme compared to "GTK"

Change-Id: I5a9188461328597725e9f96506d090dd5a728da9
Signed-off-by: Lars Vogel <Lars.Vogel@vogella.com>
diff --git a/bundles/org.eclipse.ui.themes/plugin.properties b/bundles/org.eclipse.ui.themes/plugin.properties
index 7acc982..5c07e5c 100644
--- a/bundles/org.eclipse.ui.themes/plugin.properties
+++ b/bundles/org.eclipse.ui.themes/plugin.properties
@@ -13,7 +13,7 @@
 Plugin.providerName = Eclipse.org
 
 theme.classic = Classic
-theme.gtk = GTK
+theme.gtk = Light
 theme.mac = Mac
 theme.win = Windows
 theme.dark = Dark