As far as I know Mageia does not have a LibreOffice language pack for Farsi, but there is a Farsi download available from LibreOffice
https://www.libreoffice.org/download/?nodetect If you install an RPM package from libreOffice.org be aware that the mageia software installer will alert you that the package is not signed with the Mageia key. This does not mean there is anything wrong with the package.
You could raise a bug report to have Farsi added to Mageia
https://bugs.mageia.org/