Variable: language-info-alist

Alist of language environment definitions.
Each element looks like:
where LANGUAGE-NAME is a string, the name of the language environment,
KEY is a symbol denoting the kind of information, and
INFO is the data associated with KEY.
Meaningful values for KEY include

documentation value is documentation of what this language environment
is meant for, and how to use it.
charset value is a list of the character sets mainly used
by this language environment.
sample-text value is an expression which is evalled to generate
a line of text written using characters appropriate
for this language environment.
setup-function value is a function to call to switch to this
language environment.
exit-function value is a function to call to leave this
language environment.
coding-system value is a list of coding systems that are good for
saving text written in this language environment.
This list serves as suggestions to the user;
in effect, as a kind of documentation.
coding-priority value is a list of coding systems for this language
environment, in order of decreasing priority.
This is used to set up the coding system priority
list when you switch to this language environment.
value is a charset of dimension one to use for
converting a unibyte character to multibyte
and vice versa.
input-method value is a default input method for this language
features value is a list of features requested in this
language environment.
value is a list of non-standard encoding names used
in extended segments of CTEXT. See the variable
`ctext-non-standard-encodings' for more detail.

The following key takes effect only when multibyte characters are
globally disabled, i.e. the default value of `enable-multibyte-characters'
is nil (which is an obsolete and deprecated use):

unibyte-display value is a coding system to encode characters for the terminal. Characters in the range of 160 to 255 display not as octal escapes, but as non-ASCII characters in this language environment.