[gnome-calendar] window: add context to a tooltip string

[Piotr Drąg <piotrdrag src gnome org>]

commit cf13c0cbb1048cad47fd7e2027ac94c19b249193
Author: Piotr Drąg <piotrdrag gmail com>
Date:   Mon Mar 27 20:22:17 2017 +0200

    window: add context to a tooltip string
    
    To disambiguate it from the exact same string in AppData.
    Some languages need to translate them differently.

 data/ui/window.ui |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/ui/window.ui b/data/ui/window.ui
index a7d9267..6c06078 100644
--- a/data/ui/window.ui
+++ b/data/ui/window.ui
@@ -275,7 +275,7 @@
             <property name="visible">True</property>
             <property name="can_focus">True</property>
             <property name="receives_default">True</property>
-            <property name="tooltip_text" translatable="yes">Search for events</property>
+            <property name="tooltip_text" translatable="yes" context="tooltip">Search for events</property>
             <child>
               <object class="GtkImage" id="search_button_image">
                 <property name="visible">True</property>