renamed new translator functions and update comments

renamed translate2() to translate()
renamed processOperator2() to processOperator()
renamed getInternalFunction() to processInternalFunction(), made private
renamed getParenToken() to processParenToken(), made private
updated comments on several functions, added minor comment
removed m_exprMode member variable (only used by old translator)
rearranged new translator functions

put functions in a logically calling order