[gnome-builder] tooltips: add tooltip for close document button

[Christian Hergert <chergert src gnome org>]

commit 0073c1422eca5d4dd60cf17d83bf7a076e2646e1
Author: Christian Hergert <christian hergert me>
Date:   Mon Feb 15 14:08:09 2016 -0800

    tooltips: add tooltip for close document button

 data/ui/ide-layout-tab.ui |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/ui/ide-layout-tab.ui b/data/ui/ide-layout-tab.ui
index 8b28a9a..c55a8f5 100644
--- a/data/ui/ide-layout-tab.ui
+++ b/data/ui/ide-layout-tab.ui
@@ -120,6 +120,7 @@
             <property name="valign">center</property>
             <property name="margin-start">8</property>
             <property name="margin-end">11</property>
+           <property name="tooltip-text" translatable="yes">Close the current document</property>
             <style>
               <class name="close"/>
             </style>