Hi Victor
Language import should always be performed in client 000.
You then need to run supplementation to copy translation to other clients (to perform for each language in each client).
Supplementation does now include the copy of language that was performed with RSREFILL before NW version 6.20
Best regards
1996550 - RSTLAN_SUPPLEMENT_UNI: Missing RSREFILL function
As of Release 6.20, the RSREFILL (Transport Translations Between Clients) function is integrated into the language supplementation function (see SAP Note 43853), because the report RSREFILL itself is obsolete; you can therefore no longer execute the RSREFILL function without carrying out language supplementation at the same time.