About calta usage (not perfect but at least it is here):

usage: "calta fr" (or whatever language you choose) or 
"pike calta.pike /usr/local/caudium/server/etc/include/camas/language.templates/ fr"

this will generate language.fr from language.def
with strings marked as described in language.def at the top
now you need to edit the language.fr file after you're done calta fr will
generates both the pike file and updates language.fr accordingly.

When editing language.def, don't forget to use tabs (\t) and not space to
separate elements.

Last but not least: don't execute this to other language than those in
../../server/