feat(update-modal): display last 5 release notes instead of single

- Modified backend to fetch last 5 releases from GitHub API
- Updated frontend to iterate through and display multiple releases
- Added latest badge and publish date styling
- Added update.latestBadge translation key to all locales
- Maintains backward compatibility for single changelog display

locales/en.json

@@ -1214,6 +1214,7 @@
         "checkingUpdates": "Checking for updates...",
         "checkingMessage": "Please wait while we check for the latest version.",
         "showNotifications": "Show update notifications",
+        "latestBadge": "Latest",
         "updateProgress": {
             "preparing": "Preparing update...",
             "installing": "Installing update...",