[General] Wiki UI i18n enabled

[Jared Rhine]

To support people's desire for localized wiki pages:

   https://bugzilla.osafoundation.org/show_bug.cgi?id=11146

I've turned the language-selection widget back on in the Chandler  
Project wiki (it's in the header, next to jump/search).  Parts of the  
UI (edit, search, etc) get localized, though the site is still heavily  
English.  (The "only-partly localized" look-and-feel is what caused us  
to skip using the pulldown when it first became available.)

The bug above describes a short procedure for supporting localized  
wiki pages.  That procedure should auto-detect based on browser  
settings or can be manually changed using the pulldown, but it will  
also fallthrough to the English page if no localized version of a  
given page is available.

The procedure involves maintaining an "if/then" block on the localized  
page.  This is a hassle, but I think workable for now for the scope of  
what we want to do.

-- Jared