Pontoon/AMO Frontend: Update Spanish (Argentina) (es-AR)

Co-authored-by: Marcelo Poli <[email protected]> (es-AR)

Author: mozilla-pontoon

locale/es_AR/LC_MESSAGES/amo.po

@@ -2420,7 +2420,7 @@ msgstr "Aún no hay revisiones"
 msgid "Rated %(ratingAverage)s by 1 reviewer"
 msgid_plural "Rated %(ratingAverage)s by %(ratingCount)s reviewers"
 msgstr[0] "Calificado %(ratingAverage)s por 1 revisor"
-msgstr[1] ""
+msgstr[1] "Calificado %(ratingAverage)s por %(ratingCount)s revisores"
 
 #: src/amo/pages/Addon/index.js:291
 msgid "About this dictionary"