[geary: 1/2] Add missing tooltip for compose message button

[Michael Gratton <mjog src gnome org>]

commit 31919cb4cad080637711b4a42ea257eebfb11105
Author: Kristian Klausen <kristian klausen dk>
Date:   Wed Feb 20 16:39:37 2019 +0100

    Add missing tooltip for compose message button

 ui/main-toolbar.ui | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/ui/main-toolbar.ui b/ui/main-toolbar.ui
index d5c60e38..9dbc5c1b 100644
--- a/ui/main-toolbar.ui
+++ b/ui/main-toolbar.ui
@@ -21,6 +21,7 @@
             <property name="focus_on_click">False</property>
             <property name="receives_default">False</property>
             <property name="action_name">win.new-message</property>
+            <property name="tooltip_text" translatable="yes">Compose Message</property>
             <property name="always_show_image">True</property>
             <child>
               <object class="GtkImage" id="compose_new_message_image">