Fix casing and formatting in i18n.ts which was causing compile errors

Author: SkySwimmer

apps/server/src/services/i18n.ts

@@ -18,7 +18,7 @@ const DAYJS_LOADER: Record<LOCALE_IDS, () => Promise<typeof import("dayjs/locale
     "he": () => import("dayjs/locale/he.js"),
     "ja": () => import("dayjs/locale/ja.js"),
     "ku": () => import("dayjs/locale/ku.js"),
-    "pt_BR": () => import("dayjs/locale/pt_BR.js"),
+    "pt_br": () => import("dayjs/locale/pt-br.js"),
     "ro": () => import("dayjs/locale/ro.js"),
     "ru": () => import("dayjs/locale/ru.js"),
     "tw": () => import("dayjs/locale/zh-tw.js"),