[gnome-calculator] Changed ln in programming mode to lb (bgo#789152)

[Robert Roth <robertroth src gnome org>]

commit 603ba1e26e543a478c756630decc86727577b028
Author: Robert Roth <robert roth off gmail com>
Date:   Wed Nov 1 20:47:12 2017 +0200

    Changed ln in programming mode to lb (bgo#789152)

 src/buttons-programming.ui |    8 ++++----
 1 files changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/src/buttons-programming.ui b/src/buttons-programming.ui
index 6e14dfe..009353c 100644
--- a/src/buttons-programming.ui
+++ b/src/buttons-programming.ui
@@ -1288,16 +1288,16 @@
           </packing>
         </child>
         <child>
-          <object class="GtkButton" id="calc_natural_logarithm_button">
-            <property name="label">ln</property>
+          <object class="GtkButton" id="calc_binary_logarithm_button">
+            <property name="label">log₂</property>
             <property name="visible">True</property>
             <property name="can_focus">True</property>
             <property name="receives_default">True</property>
             <property name="use_underline">True</property>
             <property name="focus_on_click">False</property>
-            <property name="tooltip_text" translatable="yes">Natural Logarithm</property>
+            <property name="tooltip_text" translatable="yes">Binary Logarithm</property>
             <property name="action_name">cal.insert-general</property>
-            <property name="action_target">'ln '</property>
+            <property name="action_target">'log₂ '</property>
           </object>
           <packing>
             <property name="left_attach">8</property>