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Fragment of a discussion from Support/LiquidThreads
To find out what the name of any message in the interface of a page is (so that you can translate it) type ?uselang=qqx at the end of the URL of the page. Try this plainlink to your main page http://tn.wikipedia.org/wiki/Main_Page?uselang=qqx. Then in translatewiki.net put the name of a message, say tryexact in the search box, then click on a result MediaWiki:Tryexact/ for any language code. Then change the language code to tn in the address bar and click on the Create tab. See FAQ.
The text in the orange box you can translate by editing the main page itself, if you have enough user rights to edit that page.