[gnome-color-manager] Mark missing strings for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit eb7b988a8170e4cc0d1c9ef5b963641ab3a481a3
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Sep 28 13:20:58 2017 +0200

    Mark missing strings for translation
    
    Unfortunately, Glade suffers from
    https://bugzilla.gnome.org/show_bug.cgi?id=782753

 src/gcm-picker.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/gcm-picker.ui b/src/gcm-picker.ui
index 05600ee..6a5f823 100644
--- a/src/gcm-picker.ui
+++ b/src/gcm-picker.ui
@@ -321,7 +321,7 @@ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
       <object class="GtkHeaderBar" id="headerbar">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="title">Color Picker</property>
+        <property name="title" translatable="yes">Color Picker</property>
         <property name="show_close_button">True</property>
         <child>
           <object class="GtkButton" id="button_measure">