google translate inside your emacs
(require 'g-trans)
M-x g-trans-translate
You can set default source/target languages by adding (setq g-trans-default-source-lang "<language_code>") and (setq g-trans-default-target-lang "<language_code>") to your init.el
(setq g-trans-default-source-lang "<language_code>")
(setq g-trans-default-target-lang "<language_code>")
init.el