[gnome-calendar] Update Catalan translation

[Jordi Mas <jmas src gnome org>]

commit 36e4145296d7efa9f7c4ca2e35097f52e5a8a833
Author: Jordi Mas <jmas softcatala org>
Date:   Wed Aug 28 15:42:16 2019 +0200

    Update Catalan translation

 po/ca.po | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/po/ca.po b/po/ca.po
index 1a8b4b29..08ad9b28 100644
--- a/po/ca.po
+++ b/po/ca.po
@@ -658,7 +658,7 @@ msgstr "Cita sense nom"
 #: src/gui/gcal-event-widget.c:428
 #, c-format
 msgid "At %s"
-msgstr "El %s"
+msgstr "A %s"
 
 #: src/gui/gcal-quick-add-popover.c:117
 #, c-format