[gnome-chess] Update Catalan translation

[Jordi Mas <jmas src gnome org>]

commit 8b6fba7c05a5b08370fb3058479f820a703e9082
Author: Jordi Mas <jmas softcatala org>
Date:   Tue Apr 21 20:38:43 2020 +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 939f543..aa5dbb7 100644
--- a/po/ca.po
+++ b/po/ca.po
@@ -301,7 +301,7 @@ msgstr ""
 
 #: data/org.gnome.Chess.gschema.xml:118 data/org.gnome.Chess.gschema.xml:119
 msgid "Difficulty of the opponent chess engine"
-msgstr "Nivell de dificultat del contrincant que sigui el motor d'escacs"
+msgstr "Nivell de dificultat del contrincant quan sigui el motor d'escacs"
 
 #. Preferences dialog: Combo box entry for time limit
 #. Preferences dialog: Combo box entry for timer increment