Hi,
For the FULL user experience in desired language shall we install the :
Language Packs (.Cab files) only?
Language Experience Pack (.Appx files) only?
Language packs (LPs) + Language Experience Packs (LEP) ?
Note: Even checking this link I am still not sure what to use to give end user a fully localized experience i.e, there should NOT be required to download any support files after installation.