4.15.1

- Drop close button
- Add new app icon and switch to rDNS
- Limit popup completion width to be same as entry
- Switch to a few symbolic icons
- Add keywords to .desktop files to xfce4-appfinder
- Translation Updates:
  Albanian, Bulgarian, Chinese (China), Chinese (Hong Kong), Danish,
  Eastern Armenian, English (Canada), Estonian, Finnish, French,
  Galician, German, Hebrew, Hungarian, Italian, Japanese, Kazakh, Korean,
  Lithuanian, Norwegian Bokmål, Portuguese, Portuguese (Brazil),
  Russian, Spanish, Turkish