Hints for gnome-font-viewer in main

Hints

• metainfo-validation-hint
  Validation of the metainfo file yielded the following hint: Found invalid tag: 'kudos'. This tag is a GNOME-specific extension to AppStream and is not supported by all implementations.
• metainfo-validation-hint
  Validation of the metainfo file yielded the following hint: The component ID [org.gnome.font-viewer.desktop] contains a hyphen/minus. Using a hyphen is strongly discouraged, to keep interoperability with other tools such as D-Bus. Ideally, replace any hyphens with an underscore ('_')