Update `Portuguese (Brazil)` translation

Currently translated at 10.5% (13 of 123 strings)

Translation: Wiki-Bot/Dashboard
Translate-URL: https://weblate.frisk.space/projects/wiki-bot/dashboard/pt-br/

dashboard/i18n/pt-br.json

@@ -1,6 +1,6 @@
 {
     "fallback": [
-        " ",
+        "en",
         " ",
         " ",
         " ",