Merge pull request #773 from josepvm/master

Updated Catalan translation (some minor fixes)
Fix build without JsonGlib
Fix building of file manager :)
Updated Danish translation
Exposure IOP: break deflicker a bit more. To be reverted once 1.6 is out!
Merge pull request #775 from pryds/master

Updated Danish translation
cmake: use LibFindMacros
Silence a CMake warning
cmake: fix error in FindLibsecret.cmake
Fix a small leak found by Coverity
Tiny code change to fix show_icons_in_paint_c.pl

... by removing some intraproject dependencies from the code.
OSX: fix DPI detection
fix possible use of uninitialized value in previous commit
[l10n] Update Spanish translation
Set all content of buf[PATH_MAX] to 0 upon allocation

Makes bt's that contain such buf's a little bit more beatiful.

Relevant Coccinelle patch:

@@
type T;
identifier tmp;
@@
- T tmp[PATH_MAX];
+ T tmp[PATH_MAX] = {0};
Updated Catalan translation