Hints for stacer in main

Warnings

• asv-metainfo-invalid-icon-type
  fr.quentium.stacer.metainfo.xml:27 - cached
  Metainfo files may only contain icons of type `stock` or `remote`, the set type is not allowed.
• asv-url-invalid-type
  fr.quentium.stacer.metainfo.xml:35 - repository
  Invalid `type` property for this `url` tag. URLs of this type are not known in the AppStream specification.
• 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).