chore: Add polyglot geokret

Author: kumy

website/app-templates/smarty/egg.tpl

@@ -0,0 +1,6 @@
+{t}
+🎉 You discovered The Polyglot Shadow 👅
+🌍 A mysterious figure fluent in every language of the world, watching the paths of travelers silently. Only those who seek beyond the ordinary can encounter it — and now, you've crossed its path!
+✨ Log your discovery: https://geokrety.org/m/POLYGK
+Please do not translate this string to let next translators discover it!
+{/t}