4.12.1

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- Fix glade directory information in .pc file (bug #11353)
- Add shortcuts for xfwm4 to tile windows to corners (bug #11652)
- Remove unused 'has_member' variable in xfce4-about (bug #11654)
- Update .gitignore
- Increase xfce4-about default size
- Improve formatting of translators list
- Update translation contributors in xfce4-about
- Update contributors lists
- Translation updates: Bulgarian, Chinese (China), Croatian, Czech, Dutch
  (Flemish), French, German, Hebrew, Indonesian, Italian, Japanese, Kazakh,
  Korean, Malay, Polish, Portuguese, Russian, Serbian, Slovak, Spanish, Thai,
  Turkish, Ukrainian