manual translation

i’ve seen many wordpress plugins for this but they do not work well they do automatic translation and translate admin panel page — i dont want this..
what i need to do is manual translation on wordpress pages/posts and have a url rewriting on the site eg. site.tld/en/post/ (english), site.tld/es/post/ (spanish),etc
im looking for something that enables manual translation and use URL rewriting eg. site.tld/CC/post/ where CC is country code..
so, i ask if there is some src code to enable manual translation of the pages/posts with URL rewriting enabled or some good plugin that i can use?
thks.