The Fluxbox edition uses Slim as the display manager / login screen. It is very lightweight but it does not provide that many features. To be able to choose the language at login, use GDM as the display manager.
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sudo apt-get install gdm
It should tell you that you can only use one display manager and ask you to choose. Select GDM. Note that it might be a decent sized download depending on what else you have installed.