Ship Brazilian Portuguese

Community translation by bkrz, reviewed and applied via Weblate (~32% of
strings). Adds the pt-BR locale entry plus changelog notes in every locale.

app/src/main/res/xml/locales_config.xml

@@ -15,5 +15,6 @@
     <locale android:name="fr" />
     <locale android:name="it" />
     <locale android:name="pl" />
+    <locale android:name="pt-BR" />
     <locale android:name="zh-CN" />
 </locale-config>