[totem] opensubtitles: Mark a forgotten string for translation

[Piotr Drąg <piotrdrag src gnome org>]

commit 932d0378f57f30548d47e066fed4d5ff9bb6ba45
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Thu Aug 10 23:18:11 2017 +0200

    opensubtitles: Mark a forgotten string for translation

 src/plugins/opensubtitles/opensubtitles.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/src/plugins/opensubtitles/opensubtitles.ui b/src/plugins/opensubtitles/opensubtitles.ui
index 07eef43..d0f8161 100644
--- a/src/plugins/opensubtitles/opensubtitles.ui
+++ b/src/plugins/opensubtitles/opensubtitles.ui
@@ -135,7 +135,7 @@
                 </child>
                 <child>
                   <object class="GtkButton" id="close_button">
-                    <property name="label">_Close</property>
+                    <property name="label" translatable="yes">_Close</property>
                     <property name="visible">True</property>
                     <property name="can_focus">True</property>
                     <property name="can_default">True</property>