Add missing i18n key + translate 2 keys for polish

src/languages/en.js

@@ -306,4 +306,5 @@ export default {
     "One record": "One record",
     steamApiKeyDescription: "For monitoring a Steam Game Server you need a Steam Web-API key. You can register your API key here: ",
     "Current User": "Current User",
+    recent: "Recent",
 };

src/languages/pl.js

@@ -303,4 +303,6 @@ export default {
     records: "rekordy",
     "One record": "Jeden rekord",
     steamApiKeyDescription: "Do monitorowania serwera gier Steam potrzebny jest klucz Steam Web-API. Możesz zarejestrować swój klucz API tutaj: ",
+    "Current User": "Aktualny użytkownik",
+    recent: "Ostatnie",
 };