Hints for cura in main

Warnings

• asv-cid-desktopapp-is-not-rdns
  cura.appdata.xml:4 - cura.desktop
  The component ID is not a reverse domain-name. Please update the ID to avoid future issues and be compatible with all AppStream implementations. You may also consider to update the name of the accompanying .desktop file to follow the latest version of the Desktop-Entry specification and use a rDNS name for it as well. In any case, do not forget to mention the new desktop-entry in a <launchable/> tag for this component to keep the application launchable from software centers and the .desktop file data associated with the metainfo data.
• asv-screenshot-no-media
  cura.appdata.xml:27 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• screenshot-download-error
  Error while downloading screenshot from 'http://software.ultimaker.com/Cura.png': HTTP request returned status code 404 (Not Found)
  This might be a temporary server issue, or the screenshot is no longer available.
• translations-not-found
  Unable to add languages information, even though a translation tag was present in the MetaInfo file. Please check that its value is set correctly, and all locale files are placed in the right directories (e.g. /usr/share/locale/*/LC_MESSAGES/ for Gettext .mo files).