1.6.12

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- Fix deadlock in mutex causing Thunar to hang (Bug #13481)
- Add support for Exif:ImageDescription and Exif:UserComment
- Do not pass NULL to g_file_test
- Bump libxfce4panel version for TPA plugin to 4.9.0
- Switch from XfcePanelImage to GtkImage
- Fixed a compilation error with the newest dev panel API
- Translation updates: Catalan, Dutch (Flemish), Galician, Korean, Lithuanian,
  Spanish, Thai