Inter-language link

Under what group (or where, if anyone can tell me) would I be able to find (and change) the inter-language link name (e.g. on Wikipedia, you can go to an article and choose from a list of languages for that article on the left hand side) for Anglo-Saxon on MediaWiki? It is currently "Anglo-Saxon", but it should be either "Englisc" or "Ænglisc" (doesn't matter which one).

Gott wisst‎

See FAQ#How do I localise language names?
By the way, it used to be "Englisc" until CLDRs language names were given priority.

Purodha Blissenbach‎

Not in this case. This is about the autonym in Names.php.

Siebrand‎