Dconf 0.17.0 Fixes a Semi-serious Thread Safety Issue

While Dconf 0.16.1 only updates the Indonesian translation and fixes a crash when using DConfChangeset in two threads, the development version 0.17.0 fixes a semi-serious thread safety issue, and improves the editor by fixing some compile warnings, canceling searches on escape and using gresource.

Moreover, the following translations have been updated in Dconf 0.17.0: Brazilian Portuguese, Czech, Esperanto, Friulian, Galician, German, Hebrew, Indonesian, Lithuanian, Malayalam, Norwegian Bokmal, Slovak, Slovenian, Spanish and Tajik.