Browsing Cornish translation

note: 'Button text for canceling the closing of the browser or the last incognito window when one or more downloads are in progress.'
note: "Confirm MessageBox Dialog's 'No' button text"
note: 'Text to show for the deny button for the register protocol handler request infobar.'
note: 'The combobox value for the Mozc input method preference'
in: upstream/cr-28.0.1500.95/chrome/app/chromeos_strings.grdp, as IDS_OPTIONS_SETTINGS_LANGUAGES_MOZC_HISTORY_LEARNING_LEVEL_NO_HISTORY
in: upstream/cr-28.0.1500.95/chrome/app/generated_resources.grd, as IDS_DOWNLOAD_REMOVE_CONFIRM_CANCEL_BUTTON_LABEL