Add i18n support

server/i18n.ts

@@ -0,0 +1,16 @@
+import { signal } from "@preact/signals";
+
+export type I18NMap = { [x: string]: string | I18NMap };
+
+export const i18n_map = signal<I18NMap>({});
+const NOT_FOUND = "__NOT_FOUND__";
+
+export default function t(key: string) {
+    const keys = key.split(".");
+    let map: string | I18NMap = i18n_map.value;
+    for (const k of keys) {
+        if (typeof map === "string") return NOT_FOUND;
+        else map = map[k];
+    }
+    return typeof map === "string" ? map : NOT_FOUND;
+}