Board Thread:Questions and Answers/@comment-26854984-20150814235019/@comment-24577221-20150815153228

I'd suggest "linked" rather than "merged": the English wiki's files are linked to the Russian wiki, or vice versa. If the Russian wiki fails to find a file in its own database, it looks in the linked wiki's database. "Merged" strongly implies that the two are combined to make just one.

What you're describing is rather like the "path" environment variable in many operating systems: a list of locations to look in for a specified file. I don't see a strong reason to limit the list of wikis to just 1 (apart from the wiki looking in its own database), but I know nothing about how this feature would be implemented in wiki-land. My lack of knowledge shouldn't influence your designs. :-)