Update:

4.13.4
======
- Fix missing gresource file in release tarball (Bug #13705)
- Add Vala support (Vidar Haarr)
- Fix gladeui2 path detection (Bug #13944)
- Fix make distcheck (Bug #14039)
- Fix incorrect use of AC_ARG_ENABLE(tests..) (Bug #13703)
- Use BOOLEAN instead of deprecated BOOL
- Allows to properly show some characters, such as ampersand (Bug #12715)
- Add api indices in gtk-doc
- Translation Updates: Amharic, Arabic, Asturian, Bulgarian, Catalan, Czech, Danish, German, Greek, English (Australia), English (United Kingdom), Spanish, Basque, Finnish, French, Galician, Hebrew, Croatian, Hungarian, Indonesian, Icelandic, Italian, Japanese, Kazakh, Korean, Lithuanian, Malay, Norwegian Bokm奪l, Dutch, Norwegian Nynorsk, Occitan (post 1500), Polish, Portuguese, Portuguese (Brazil), Romanian, Russian, Slovak, Slovenian, Serbian, Swedish, Telugu, Thai, Turkish, Uighur, Ukrainian, Chinese (China), Chinese (Hong Kong), Chinese (Taiwan)

4.13.3
======
- Fix make distcheck with gladeui2 install path
- Add an --enable-tests option
- Remove the filterout from introspection sources
- Move gresource building out of maintainer mode
- Fix condition in confirm dialog
- Add POTFILES.skip to appease gmake distcheck gods on OpenBSD
- ship libxfce4ui.gresource.xml in the tarball too
- Add libxfce4ui-marshal.list to EXTRA_DIST to fix
  --enable-maintainer-mode on released tarballs
- Fix build error with --disable-gtk2
- Translation updates: bg, cs, fr, it, ca, hr, it, da, ru.

4.13.2
======
- Fix build error with --disable-gtk3 Bug #12648
- Improve layout of labels in xfce dialogs
- Set a reasonable default window width to make sure labels wrap
- Improve vertical alignment of primary and secondary label
- Bump the default dialog width to 500px
- Update libxfce4ui documentation
- Fix make docs compilation warning
- Fix xfce_dialog_show_help(_with_version) doc
- Remove Makefile.am space to fix autogen.sh warning
- Better documentation processing
- Change xfce_dialog_show_help(_with_version)
- Default debug to yes instead of full
- Remove exo dependancy Bug #13326
- fix: add libxfce4ui_get_resource to abi check symbols Bug #13326
- Let autotools find and invoke glib-compile-resources Bug #13326
- Add support for GOBJECT-INTROSPECTION Bug #13461
- Add GtkDoc checks
- Add missing introspection.m4 file
- fix: make distcheck
- fix: remove deprecation warnings
- feat: Switch to Gtk3 default, Gtk2 Optional
- Rename introspection GIR to 4ui-2.0 to match util
- Translation updates: am ast ca da el eu fi gl id it ko lt ms nn
                       oc pl pt ro ru sl sr th zh_CN zh_TW


(youri)