Add Polish translation

src/js/i18n/i18n.ts

@@ -17,6 +17,7 @@ export const supportedLanguages = [
   'id',
   'it',
   'pt',
+  'pl',
   'nl',
   'da',
   'sv',
@@ -42,6 +43,7 @@ export const languageNames: Record<SupportedLanguage, string> = {
   id: 'Bahasa Indonesia',
   it: 'Italiano',
   pt: 'Português',
+  pl: 'Polski',
   nl: 'Nederlands',
   da: 'Dansk',
   sv: 'Svenska',