Hints for liferea in main

Warnings

• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:125 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:139 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:157 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:170 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:176 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:186 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• asv-description-para-markup-invalid
  net.sourceforge.liferea.appdata.xml:194 - ul
  This description paragraph contains invalid markup. Currently, only <em/> and <code/> are permitted.
• 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).
• screenshot-download-error
  Error while downloading screenshot from 'https://lzone.de/liferea/screenshots/screenshot5.png': URL was not found on the server.
  This might be a temporary server issue, or the screenshot is no longer available.