[simple-scan] Mark a string for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit f89552ea67a5317d5546819267aa89f975ea66e0
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Wed May 17 14:12:39 2017 +0200

    Mark a string for translation

 src/app-window.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/app-window.ui b/src/app-window.ui
index debb7e5..5878d69 100644
--- a/src/app-window.ui
+++ b/src/app-window.ui
@@ -653,7 +653,7 @@
         <property name="visible">True</property>
         <property name="can_focus">False</property>
         <property name="vexpand">True</property>
-        <property name="title">Simple Scan</property>
+        <property name="title" translatable="yes" comments="Title of scan window">Simple Scan</property>
         <property name="show_close_button">True</property>
         <child>
           <object class="GtkBox" id="open_box">