### Discussed in https://github.com/ckan/ckan/discussions/8663 <div type='discussions-op-text'> <sup>Originally posted by **daveytyke** February 11, 2025</sup> Hi all, I'm doing some accessibility work on our CKAN instance and we're getting an error on the language setup. in our .ini file we have set - ckan.locale_default = en_GB This results in each web page having the following set up - <html lang="en_GB class= "js"> However, it should be <html lang="en-GB class= "js"> a small but significant change. How can we make this correct? (Changing to ckan.locale_default = en-GB crashes the service). </div>