Solution : https://service.sap.com/sap/support/notes/215655 (SAP Service marketplace login required)
Key words : 
delete/create table ddftx 314159 language transport overwrites eudb entries 317122 status yellow, language supplementing 337905 incorrect lang supp tables 339250 incomplete language supplementation solution 1, path'sap library'> 'basis components'> 'change, language import 326801 activating sapscript forms, language transport 303196 obsolete screen texts, support packages 211218 language import hangs, parameter file tp_domain_<sid>, transport control program tp, execute function module dd_int_ddftx_reset, /usr/sap/trans/eps/
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