Improve MineGeo interface and functionality

lib/i18n.ts

@@ -0,0 +1,31 @@
+import "server-only";
+import { cache } from "react";
+import { cookies, headers } from "next/headers";
+import {
+  detectLocale,
+  languageCookie,
+  localeTag,
+  resolveLocale,
+  translator,
+  type LanguagePreference,
+} from "@/shared/i18n";
+
+export const getI18n = cache(async () => {
+  const [jar, requestHeaders] = await Promise.all([cookies(), headers()]);
+  const preference = jar.get(languageCookie)?.value;
+  const locale = resolveLocale(
+    preference,
+    requestHeaders.get("accept-language"),
+  );
+  const languagePreference: LanguagePreference =
+    preference === "en" || preference === "ru" ? preference : "auto";
+  return {
+    locale,
+    preference: languagePreference,
+    detectedLocale: detectLocale(requestHeaders.get("accept-language")),
+    t: translator(locale),
+    formatNumber: (value: number) => value.toLocaleString(localeTag(locale)),
+    formatDate: (value: string) =>
+      new Date(value).toLocaleDateString(localeTag(locale)),
+  };
+});