[epiphany] Kill GtkVButtonBox.

[Arnaud Bonatti <arnaudb src gnome org>]

commit 48bc397bb7ef12c62e95fdd9a482c3be45eb6c8c
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Tue Oct 20 01:01:47 2015 +0200

    Kill GtkVButtonBox.

 src/resources/prefs-dialog.ui |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/resources/prefs-dialog.ui b/src/resources/prefs-dialog.ui
index 7e75476..bce778d 100644
--- a/src/resources/prefs-dialog.ui
+++ b/src/resources/prefs-dialog.ui
@@ -646,6 +646,7 @@
                               <object class="GtkTreeView" id="lang_treeview">
                                 <property name="visible">True</property>
                                 <property name="headers-visible">False</property>
+                                <property name="fixed-height-mode">True</property>
                                 <child internal-child="selection">
                                   <object class="GtkTreeSelection" id="treeview-selection"/>
                                 </child>
@@ -654,10 +655,10 @@
                           </object>
                         </child>
                         <child>
-                          <object class="GtkVButtonBox">
+                          <object class="GtkGrid">
                             <property name="visible">True</property>
-                            <property name="spacing">6</property>
-                            <property name="layout-style">start</property>
+                            <property name="row-spacing">6</property>
+                            <property name="orientation">vertical</property>
                             <child>
                               <object class="GtkButton" id="lang_add_button">
                                 <property name="label" translatable="yes">_Add</property>