16. The system of claim 15 wherein the computer readable program code configured to identify the original language is further configured to: calculate a confidence score based on the given pair vector and the threshold vector distance; and identifying the original language based on the confidence score.
15. A system comprising: a computing processor; and a computer readable storage medium operationally coupled to the processor, the computer readable storage medium having computer readable program code embodied therewith to be executed by the computing processor, the computer readable program code configured to: retrieve the translated document; identify a language of the retrieved document; calculate a language model for the language of the retrieved document (LM(RD)); calculate a distinct vector as a difference between LM(RD) and a common language model for the language of the retrieved document (LMT(RD)); obtain pair vectors for language model pairs associated with the language of the retrieved document; calculate a vector distance between the distinct vector and each pair vector; identify a given pair vector within a threshold vector distance based on the calculated vector distance; identify the original language corresponding to the given pair vector as the original language of the retrieved document; and retrieve an original document in the original language of the retrieved document, wherein the original document was translated into the retrieved document.