Update `Portuguese (Brazil) (pt-br)` translation

Currently translated at 99.4% (585 of 588 strings)

Translation: Wiki-Bot/Discord
Translate-URL: https://translate.wikibot.de/projects/wiki-bot/discord/pt-br/

i18n/pt-br.json

@@ -432,6 +432,7 @@
         "total": "$1 {{PLURAL:$2|problema|problemas}} corrigidos"
     },
     "overview": {
+        "admins": "Administradores:",
         "articles": "Artigos:",
         "comments": "Comentários do artigo:",
         "created": "Criado:",