View file wordpress/wp-includes/js/tinymce/plugins/paste/langs/en.js
// UK lang variables tinyMCE.addToLang('',{ paste_text_desc : 'Paste as Plain Text', paste_text_title : 'Use CTRL+V on your keyboard to paste the text into the window.', paste_text_linebreaks : 'Keep linebreaks', paste_word_desc : 'Paste from Word', paste_word_title : 'Use CTRL+V on your keyboard to paste the text into the window.', selectall_desc : 'Select All' });