[gnome-calendar] Grammar. Fixes #249

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 11fdd100d8b8802a452d30cf36a1779969adb75b
Author: Harald H <harald fsfe org>
Date:   Mon Apr 2 14:02:26 2018 +0000

    Grammar. Fixes #249

 data/appdata/org.gnome.Calendar.appdata.xml.in | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/data/appdata/org.gnome.Calendar.appdata.xml.in b/data/appdata/org.gnome.Calendar.appdata.xml.in
index e8a8ddfa..64124e18 100644
--- a/data/appdata/org.gnome.Calendar.appdata.xml.in
+++ b/data/appdata/org.gnome.Calendar.appdata.xml.in
@@ -10,7 +10,7 @@
   <description>
     <p>
       GNOME Calendar is a simple and beautiful calendar application designed to perfectly fit the GNOME
-      desktop. By reusing the components which the GNOME desktop is build on, Calendar nicely integrates
+      desktop. By reusing the components which the GNOME desktop is built on, Calendar nicely integrates
       with the GNOME ecosystem.
     </p>
     <p>