Try de-activating ALL third party plugins. (use only core default plugin) and make sure they are all up to date with version 1.7.2. Also make sure your theme has been updated to 1.7.2 as well (try using the default theme as a test). Oh if you have done ANY custom mods on files that deal with the "Language" area in the admin...you'll need to update those files too.
Pete, just go to the Languages section in the Admin Panel and make sure there's a translation for these keys. If yes, click on the Save this page button to clear lang cache. Let us know if the issue persists.
Sorry far so long to get back to you ross ,it was my fault I copied the English language and add gb at the end ,I have changed it back now and its fine