Preinstall locale to enable local-gen for database localization

[icoxfog417]

Is your feature request related to a problem? Please describe. As a engineer who try to learn data engineering such as SQL on Studio Lab by ipython-sql needs local-gen to setup the teaching materials because these depend on locale. For example 100knocks-preprocess depends on ja_JP.UTF-8.

The locale in Studio Lab is only a few.

(studiolab) studio-lab-user@default:~$ locale -a
locale: Cannot set LC_MESSAGES to default locale: No such file or directory
C
C.UTF-8
POSIX

Describe the solution you'd like Preinstall locale to enable local-gen

Describe alternatives you've considered We can use default locale but the character data might be broken if we do not choose appropriate locale.

Additional context

None