Hints for remmina in main

Warnings

• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:74 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:70 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:72 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:71 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:73 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:76 -
  A screenshot must contain at least one image or video in order to be useful. Please add an <image/> to it.
• asv-screenshot-no-media
  org.remmina.Remmina.appdata.xml:75 -
  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 'https://freerdp.github.io/Remmina/images/appdata/main-en.png': Failed to retrieve 'https://freerdp.github.io/Remmina/images/appdata/main-en.png' (HTTP 404: Not Found)
  This might be a temporary server issue, or the screenshot is no longer available.
• screenshot-download-error
  Error while downloading screenshot from 'https://freerdp.github.io/Remmina/images/appdata/main-it.png': Failed to retrieve 'https://freerdp.github.io/Remmina/images/appdata/main-it.png' (HTTP 404: Not Found)
  This might be a temporary server issue, or the screenshot is no longer available.
• internal-unknown-tag
  The generator emitted a tag 'internal-unknown-tag' which is unknown. This is a bug in the metadata generator, please file a bugreport.
• internal-unknown-tag
  The generator emitted a tag 'internal-unknown-tag' which is unknown. This is a bug in the metadata generator, please file a bugreport.