Hello,

You may need to find following resource string keys:
editcontribution.deletebutton
editcontribution.editbutton
contributionlist.lnknewdoc

and change their values in resource string file: '<project_folder>\CMSResources\CMS.resx'

For more info please see: http://devnet.kentico.com/docs/devguide/international_support.htm

Best regards
Ondrej Vasil