Translation is the communication of the meaning of a source-language text by means of an equivalent target-language text."Word-for-word translation" — is an imperfect concept, because a given word in a given language often carries more than one meaning and what is beautiful in one language is often barbarous, nay sometimes nonsense, in another, so it would be unreasonable to limit a translator to the narrow compass of his author's words. [Wikipedia quotes]
There are more qualities that a translator should possess except knowledge – Creativity and Passion.