How to install Welsh?
Welsh is available in the official Kodi repository which is included by default in Kodi. You can install this addon by going in Kodi to System >> Settings >> Addons >> Get Addons >> XBMC.org Addons or Kodi.tv Addons
About SuperRepo and Welsh
SuperRepo does not maintain Welsh. We only provide an automated index for Kodi users to have easy access to Welsh and other addons for Kodi. We are not affiliated with the developers (Team Kodi) and do not provide help for this particular addon.