Browsing Cornish translation

note: 'Action link text to undo removing a thumbnail from the most visited section.'
note: 'In the Gallery, the text on the button that reverts the most recent operation.'
note: 'Text displayed on the button to undo a theme installation and go back to the previous theme.'
note: 'Text on the button to undo the delete operation.'
note: 'The Mac menu item undo in the edit menu.'
in: upstream/cr-28.0.1500.95/chrome/app/chromeos_strings.grdp, as IDS_KEYBOARD_OVERLAY_UNDO
in: upstream/cr-28.0.1500.95/chrome/app/generated_resources.grd, as IDS_THEME_INSTALL_INFOBAR_UNDO_BUTTON