Throughout the Clio interface, you can change instances of "Attorney" to "Solicitor".
The "Locale" option can be found in your Profile settings. To view your Profile, click on your user icon/initials in the Clio header then click "Profile".
On your Profile page, click the "Edit" button.
Scroll down through your Profile options to the "Locale" field and select "English (United Kingdom)".
Click the button at the bottom of the screen to save the change.