[glade] Fix typo (Forth)

[Piotr Drąg <piotrdrag src gnome org>]

commit 8c12b8120b6dd50a12a43282241c10497f3e0e31
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Fri Jan 8 12:33:51 2016 +0100

    Fix typo (Forth)

 plugins/gtk+/gtk+.xml.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/plugins/gtk+/gtk+.xml.in b/plugins/gtk+/gtk+.xml.in
index 40c4a0a..06b6198 100644
--- a/plugins/gtk+/gtk+.xml.in
+++ b/plugins/gtk+/gtk+.xml.in
@@ -4802,7 +4802,7 @@
               <!-- GdkModifierType enumeration value -->
               <value id="GDK_BUTTON3_MASK" _name="Third Mouse Button"/>
               <!-- GdkModifierType enumeration value -->
-              <value id="GDK_BUTTON4_MASK" _name="Forth Mouse Button"/>
+              <value id="GDK_BUTTON4_MASK" _name="Fourth Mouse Button"/>
               <!-- GdkModifierType enumeration value -->
               <value id="GDK_BUTTON5_MASK" _name="Fifth Mouse Button"/>
               <!-- GdkModifierType enumeration value -->