[gnome-software] Update Catalan translation

[Jordi Mas <jmas src gnome org>]

commit f3259a8c29d5ccaea24ce3a6adf60878532812d6
Author: Jordi Mas <jmas softcatala org>
Date:   Sun Mar 18 17:13:53 2018 +0100

    Update Catalan translation

 po/ca.po | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/po/ca.po b/po/ca.po
index cca4f091..b5ae7d00 100644
--- a/po/ca.po
+++ b/po/ca.po
@@ -659,8 +659,9 @@ msgstr "Menú de filtre per subcategories"
 
 #. TRANSLATORS: This is a label for the category sort drop down, which all together can read e.g. 'Sort Top 
Rated'.
 #: src/gs-category-page.ui:267
+#. N.T.: Això és el nom d'una etiqueta que apareix al costat de l'element a ordenar (p. ex. nom)
 msgid "Sort"
-msgstr "Ordena"
+msgstr "Ordena per"
 
 #: src/gs-category-page.ui:288
 msgid "Subcategories sorting menu"