data: Add X-GNOME-Shell-Utilities.directory file to allow showing real name

Instead of having the name of the directory be X-GNOME-Utilities. This
also allows translating the name to the user's language. The name is
chose to be different to X-GNOME-Utilities from GNOME Menus.

In the process, also remove the categories. The menu definition from
gnome-menus is not used, and it's not a category that apps list
themselves, so it's completely unused anyway.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/3526>

data/X-GNOME-Shell-Utilities.directory.desktop.in

@@ -0,0 +1,3 @@
+[Desktop Entry]
+Name=Utilities
+Type=Directory

data/meson.build

@@ -32,6 +32,15 @@ foreach desktop_file : desktop_files
   )
 endforeach
 
+i18n.merge_file(
+  input: 'X-GNOME-Shell-Utilities.directory.desktop.in',
+  output: '@BASENAME@',
+  po_dir: po_dir,
+  install: true,
+  install_dir: join_paths(datadir, 'desktop-directories'),
+  type: 'desktop',
+)
+
 serviceconf = configuration_data()
 serviceconf.set('libexecdir', libexecdir)
 foreach service_file : service_files