Variable: language-info-custom-alist

Customizations of language environment parameters.
Value is an alist with elements like those of `language-info-alist'.
These are used to set values in `language-info-alist' which replace
the defaults. A typical use is replacing the default input method for
the environment. Use C-h L to find the environment's settings.

This option is intended for use at startup. Removing items doesn't
remove them from the language info until you next restart Emacs.

Setting this variable directly does not take effect.
See `set-language-info-alist' for use in programs.