i18n fixes

i18n fixes

* Fix typos in several message strings, and clarify others.

* Typecast first argument of gethostbyaddr() to quash warnings.

* Load languages in finalization, not initialization, and do not crash
when running off the end of a localized strings.db file.

* Show the LANGUAGE option in NickServ SET response.

* Remove mention of GHOST command when !enable_ghost.

* Only initialize alloc_argc when !defined(NDEBUG)
git-archimport-id: srvx@srvx.net--2004-srvx/srvx--devo--1.3--patch-31