* calc/calc.el (calc-language): Add languages to docstring.
* calc/calc-ext.el (calc-init-extensions): Add keybindings
- for new languages.
+ for new languages. Autoload commands to change languages.
* calc/calc-help.el (calc-d-prefix-help): Add new languages.
("calc-lang" calc-big-language calc-c-language calc-eqn-language
calc-flat-language calc-fortran-language calc-maple-language
+calc-yacas-language calc-maxima-language calc-giac-language
calc-mathematica-language calc-normal-language calc-pascal-language
calc-tex-language calc-latex-language calc-unformatted-language)