🎨 update i18n for better fit (pt-br) (#20045)

reduce word size to fit properly within button without making style
changes (_economize_ and _poupe_ have the exact same meaning)

Co-authored-by: Ryan Feigenbaum <48868107+royalfig@users.noreply.github.com>

ghost/i18n/locales/pt-BR/portal.json

@@ -1,5 +1,5 @@
 {
-    "(save {{highestYearlyDiscount}}%)": "(economize {{highestYearlyDiscount}}%)",
+    "(save {{highestYearlyDiscount}}%)": "(poupe {{highestYearlyDiscount}}%)",
     "{{amount}} days free": "{{amount}} dias grátis",
     "{{amount}} off": "{{amount}} de desconto",
     "{{amount}} off for first {{number}} months.": "{{amount}} de desconto nos primeiros {{number}} meses.",