[gnome-todo] Fix grammar in a translatable string

[Piotr Drąg <piotrdrag src gnome org>]

commit e6f7b555ffba6193228c01c38dbce67db0648ad5
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Mon Sep 21 16:44:38 2015 +0200

    Fix grammar in a translatable string

 data/gtk/menus.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/gtk/menus.ui b/data/gtk/menus.ui
index f22db6c..854f37e 100644
--- a/data/gtk/menus.ui
+++ b/data/gtk/menus.ui
@@ -30,7 +30,7 @@
   <menu id="gear-menu">
     <section>
       <item>
-        <attribute name="label" translatable="yes">Clear completed task…</attribute>
+        <attribute name="label" translatable="yes">Clear completed tasks…</attribute>
         <attribute name="action">list.clear-completed-tasks</attribute>
       </item>
     </section>