Thread:Project:Support desk/Add a new language?

This may be impossible, but coding may help. Is there anything to do to add a language that isn't built into MediaWiki? For example, what would I do if I had a wiki farm with several languages (Spanish, English, French, German, etc.) and I wanted to add Pig Latin as a joke language? Do I have to go through changing the interface messages one-by-one on the wiki, or can I add a PHP file in the languages folder to predefine them all? And the most important, how can I get a link to the Pig Latin wiki on the sidebar of the other wikis under the "languages" section? I know almost nothing about coding, but I was just wondering.