Choose the language you want to use. The available languages correspond to those selected during the installation of the system, so be sure to select all the languages you are likely to use during the installation steps.
Thebutton allows you to activate the old compatibility (non-UTF8) encoding.
Choose the country or region: the list displays only the countries speaking the language you selected at the previous step. If the country you are looking for is not listed, click onto access the full list.
You need to restart the system for these changes to take effect.