Its a browser setting in chrome, yer tart...
Click the Customise and Control icon (three horizontal lines in the top right corner of the window) then Settings and at the bottom click Show Advanced Settings. Under Languages select Languages and spell-checker settings. Resist the urge to choose English, under English (United States); all this does is display a bizarre message that says this language cannot be used for spell checking… Instead click the Add button at the bottom of the page then select English (United Kingdom) from the drop down menu and click OK. This takes you back to the previous window where ‘Display Google Chrome in this Language’ and ‘Use this Language for spell checking’ should appear; on some versions these options have to be manually selected. Finally, click Done, or OK then close and restart Chrome, for the change to take effect.