Appstream related patches (#212)

* appdata: use appstreamcli for appdata validation

appstream-util is obsoleted by appstreamcli.

* appdata: Update appdata

- Add translation tag
- Add categories and keywords tags

* Capitalize keywords to avoid duplicate strings

* Remove catrgories and keywords

They are unnecessary for Flathub

---------

Co-authored-by: kramo <contact@kramo.hu>

data/hu.kramo.Cartridges.metainfo.xml.in

@@ -17,6 +17,7 @@
   <developer_name translatable="no">kramo</developer_name>
   <project_group>GNOME</project_group>
   <launchable type="desktop-id">@APP_ID@.desktop</launchable>
+  <translation type="gettext">cartridges</translation>
   <supports>
     <control>pointing</control>
     <control>keyboard</control>

data/meson.build

@@ -52,9 +52,9 @@ appstream_file = i18n.merge_file(
   install_dir: join_paths(get_option('datadir'), 'metainfo')
 )
 
-appstream_util = find_program('appstream-util', required: false)
-if appstream_util.found()
-  test('Validate appstream file', appstream_util, args: ['validate', appstream_file])
+appstreamcli = find_program('appstreamcli', required: false)
+if appstreamcli.found()
+  test('Validate appstream file', appstreamcli, args: ['validate', appstream_file])
 endif
 
 install_data(