[gnome-music] Mark forgotten string for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit fbcc8aa87db1087388ab3fdaf06be8a543353b8e
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Sat May 27 00:25:41 2017 +0200

    Mark forgotten string for translation

 data/PlaylistDialog.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/PlaylistDialog.ui b/data/PlaylistDialog.ui
index 2c03e27..1fe6d56 100644
--- a/data/PlaylistDialog.ui
+++ b/data/PlaylistDialog.ui
@@ -258,7 +258,7 @@
   <object class="GtkHeaderBar" id="headerbar1">
     <property name="visible">True</property>
     <property name="can_focus">False</property>
-    <property name="title">Select Playlist</property>
+    <property name="title" translatable="yes">Select Playlist</property>
     <child>
       <object class="GtkButton" id="cancel-button">
         <property name="label" translatable="yes">_Cancel</property>