feat: localisation and multi-lang support (#95)

* feat: setup localisation with lingui

* Fix hydration and locale issues

* Add missing translations and tweak selector styling

* Extend language support

* Update lang support

* Extend lang support

* Fix build and add dyanmic imports

apps/web/src/locales/index.ts

@@ -0,0 +1,14 @@
+export const locales = ["en", "fr", "de", "es", "it", "nl"] as const;
+
+export type Locale = (typeof locales)[number];
+
+export const defaultLocale: Locale = "en";
+
+export const localeNames: Record<Locale, string> = {
+  en: "English",
+  fr: "Français",
+  de: "Deutsch",
+  es: "Español",
+  it: "Italiano",
+  nl: "Nederlands",
+};