Solution : https://service.sap.com/sap/support/notes/1173582 (SAP Service marketplace login required)
Summary : 
      During an SAP export process, the error "invalid language '...' in E071.LANG" is triggered by an old bug in the internal function used for view maintenance-based transport request creation, detected due to new validations in R3trans from 2008. Immediate remediation involves re-exporting using the R3trans version as of May 28, 2008, or employing a specific debug transport request containing the RSWBO_CLEANUP_LANGFLAGS correction program. For medium-term resolution, an upcoming R3trans patch will relax these checks to reduce error severity to warnings. Long-term improvements target rectifying the core internal function to prevent such issues in future transport requests.
Key words : 
solution short-term solution, debug affected transport requests, short-term solution, medium-term solution, long-term solution, internal function module, internal function mentioned, create transport requests, error messageinvalid language ', transport request b20k095214
Related Notes : 
       
| 1251866 | Filter characteristics not transported | 
| 1245525 | Table key is not transferred to request | 
| 1127194 | R3trans import with parallel processes | 
| 1074030 | R3trans: "Duplicate key" composite SAP note (as of Rel 6.10) | 
| 19466 | Downloading SAP kernel patches | 
| 13719 | Preliminary transports to customers (note for customers) |