[gnome-characters] Add additional keywords to .desktop

[Daiki Ueno <dueno src gnome org>]

commit e4d9439bd84c018ff7cbbf6b03a548774cddbcdc
Author: Daniel Aleksandersen <code daniel priv no>
Date:   Mon Feb 29 10:53:24 2016 +0900

    Add additional keywords to .desktop
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762576

 data/org.gnome.Characters.desktop.in |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/data/org.gnome.Characters.desktop.in b/data/org.gnome.Characters.desktop.in
index 72903b3..fcf9bae 100644
--- a/data/org.gnome.Characters.desktop.in
+++ b/data/org.gnome.Characters.desktop.in
@@ -7,4 +7,4 @@ Exec=gapplication launch org.gnome.Characters
 DBusActivatable=true
 StartupNotify=true
 Categories=GNOME;GTK;Utility;X-GNOME-Utilities;
-_Keywords=characters;unicode;
+_Keywords=characters;unicode;punctuation;math;letters;emoji;emoticon;