new: add brazil region

assets/translations/strings_en.i18n.json

@@ -180,6 +180,7 @@
         "af": "Afghanistan (af) 🇦🇫",
         "id": "Indonesia (id) 🇮🇩",
         "tr": "Türkiye (tr) 🇹🇷",
+        "br": "Brazil (br) 🇧🇷",
         "other": "Other"
       },
       "themeMode": "Theme Mode",

lib/core/model/region.dart

@@ -7,6 +7,7 @@ enum Region {
   af,
   id,
   tr,
+  br,
   other;
 
   String present(TranslationsEn t) => switch (this) {
@@ -16,6 +17,7 @@ enum Region {
         tr => t.settings.general.regions.tr,
         af => t.settings.general.regions.af,
         id => t.settings.general.regions.id,
+        br => t.settings.general.regions.br,
         other => t.settings.general.regions.other,
       };
 }