[gnome-control-center] printers: Update "Add Printer" button to just "Add"

[Felipe Borges <felipeborges src gnome org>]

commit cc738c8223836da64ac383b7245c07e613c27d7e
Author: Felipe Borges <felipeborges gnome org>
Date:   Tue Feb 7 10:43:26 2017 +0100

    printers: Update "Add Printer" button to just "Add"
    
    The mockups at https://wiki.gnome.org/Design/SystemSettings/Printers
    show just the word "Add" for the button which opens the "Add Printer"
    dialog.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=778268

 panels/printers/printers.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/panels/printers/printers.ui b/panels/printers/printers.ui
index a67ff64..d5bf2e6 100644
--- a/panels/printers/printers.ui
+++ b/panels/printers/printers.ui
@@ -17,7 +17,7 @@
         <property name="visible">True</property>
         <property name="sensitive">True</property>
         <property name="use_underline">True</property>
-        <property name="label" translatable="yes" context="button">Add Printer</property>
+        <property name="label" translatable="yes" context="button" comments="Translators: This button adds 
new printer.">Add</property>
         <style>
           <class name="suggested-action"/>
         </style>