Yes. You can change the country from the side menu by going to Settings > Company and selecting the Information panel. The panel contains your company information, including the country.
If the selected country uses different default labels for common terms, CORE asks whether you want to apply the new label defaults. For example, Check may change to Cheque for UK English. Select Yes, apply new labels to replace the affected labels with the new country's default labels. This overwrites any custom labels you have set for those fields. Select No, keep my labels, or close the prompt, to save the country change without changing your existing custom labels.
Changing the country does not affect your currency or date and number format settings. These settings are managed separately. Check CORE Help for details.