Add geoButton, getGmina, messages, and translate handler files with initial implementations

js/handlers/geoButton.js

@@ -0,0 +1,9 @@
+const currentUrl = document.location.href;
+
+if (currentUrl.startsWith('https://mapy.geoportal.gov.pl/')) {
+  // Execute code specific to the example.com website
+  console.log('This is the example.com website.');
+} else {
+  // Execute default code
+  console.log('This is a different website.');
+}