This update for catfish fixes the following issues:

Update to version 4.18.0:

* Filters: Add Archives, Other, update Apps
* Use Gio to open files, fix "no default app" issue
* Add symlink emblem to thumbnails in thumbnail mode
* config: Prefer plocate over mlocate if available
* window: Avoid IndexError on right click when selection is empty
* Create shared filetype lists for searching and filtering
* Ensure site-packages directory is prepended to sys.path
* Fix double border between sidebar and results area
* window: Fix and refactor new_column()
* window: Fix markup warnings in thumbnail view
* Fix GtkBuilder warnings
* Revert "Suppress the various GTK warnings GtkBuilder outputs"
* Fix crash and translations when install prefix != /usr
* Update `.gitignore`
* Remove generated file po/catfish.pot
* Performance improvements
* Translation Updates