Thread:Support/Change of fallback for Devanagari script variant of Konkani (Goan) to Latin script/reply (3)

Not quite. The system works like this:
 * a language is enabled for translation at translatewiki.net
 * when the most often used messages are all done, a 'Messages.php' file for that language is created at Mediawiki.org and all translations from then on are exported to MediaWiki. The language is than a MediaWiki language; it appears in the drop-down lists of optional languages at Mediawiki.
 * only when a messages.php file exists on MediaWiki can a fallback be set to that language.