Hints for cura in main

Warnings

• metainfo-validation-issue
  Validation of the metainfo file found a problem: The screenshot does not contain any images.
• metainfo-validation-issue
  Validation of the metainfo file found a problem: The component ID is not a reverse domain-name. Please update the ID and that of the accompanying .desktop file to follow the latest version of the Desktop-Entry and AppStream specifications and avoid future issues.
• 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.
• gettext-data-not-found
  Unable to find any translation data for specified Gettext domain 'Cura'.
• no-translation-statistics
  We could not extract any translation statitics, althout metadata hints were given that the data exists. Please check the <translation/> metainfo tag for spelling mistakes. It also makes sense to ensure all locale files are placed in the right directories (e.g. gettext .mo files in /usr/share/locale/*/LC_MESSAGES/