[gthumb] Add a missing tag to the AppData file

[Richard Hughes <rhughes src gnome org>]

commit 4beb6fde4f169f97dfff4dcc5107fb31935c58c7
Author: Richard Hughes <richard hughsie com>
Date:   Mon Jan 25 15:57:02 2016 +0000

    Add a missing tag to the AppData file

 data/appdata/gthumb.appdata.xml.in |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/data/appdata/gthumb.appdata.xml.in b/data/appdata/gthumb.appdata.xml.in
index 8f99fd6..5afa710 100644
--- a/data/appdata/gthumb.appdata.xml.in
+++ b/data/appdata/gthumb.appdata.xml.in
@@ -48,4 +48,5 @@
     <kudo>UserDocs</kudo>
   </kudos>
   <project_group>GNOME</project_group>
+  <translation type="gettext">gthumb</translation>
 </application>