[gnome-calculator] Fixed appdata validation (bgo#784033)

[Robert Roth <robertroth src gnome org>]

commit bc5a3ac334bf33734c014bd0f2927c5a2352e111
Author: Robert Roth <robert roth off gmail com>
Date:   Thu Jun 22 15:08:20 2017 +0300

    Fixed appdata validation (bgo#784033)

 data/org.gnome.Calculator.appdata.xml.in |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/data/org.gnome.Calculator.appdata.xml.in b/data/org.gnome.Calculator.appdata.xml.in
index 8d7c06f..0c6318a 100644
--- a/data/org.gnome.Calculator.appdata.xml.in
+++ b/data/org.gnome.Calculator.appdata.xml.in
@@ -5,6 +5,7 @@
   <metadata_license>CC0-1.0</metadata_license>
   <project_license>GPL-3.0+</project_license>
   <name>GNOME Calculator</name>
+  <summary>Perform arithmetic, scientific or financial calculations</summary>
   <description>
     <p>
       GNOME Calculator is an application that solves mathematical equations.
@@ -32,19 +33,19 @@
   <screenshots>
     <screenshot>
       <image>https://people.gnome.org/~mcatanzaro/gnome-calculator-basic-mode.png</image>
-      <caption>GNOME Calculator in Basic Mode.</caption>
+      <caption>GNOME Calculator in Basic Mode</caption>
     </screenshot>
     <screenshot>
       <image>https://people.gnome.org/~mcatanzaro/gnome-calculator-advanced-mode.png</image>
-      <caption>GNOME Calculator in Advanced Mode.</caption>
+      <caption>GNOME Calculator in Advanced Mode</caption>
     </screenshot>
     <screenshot>
       <image>https://people.gnome.org/~mcatanzaro/gnome-calculator-financial-mode.png</image>
-      <caption>GNOME Calculator in Financial Mode.</caption>
+      <caption>GNOME Calculator in Financial Mode</caption>
     </screenshot>
     <screenshot type="default">
       <image>https://people.gnome.org/~mcatanzaro/gnome-calculator-programming-mode.png</image>
-      <caption>GNOME Calculator in Programming Mode.</caption>
+      <caption>GNOME Calculator in Programming Mode</caption>
     </screenshot>
   </screenshots>
   <url type="homepage">https://wiki.gnome.org/Apps/Calculator</url>