Fix

src/config/types.ts

@@ -4,7 +4,6 @@
 export type Source = {
 	repository_url?: string;
 	feedback_url?: string;
-	languages?: string[];
 	url: string;
 	port: number;
 	https?: { [x: string]: string };

src/server/api/mastodon/index.ts

@@ -60,7 +60,7 @@ router.get('/v1/instance', async ctx => { // TODO: This is a temporary implement
 			status_count: originalNotesCount,
 			domain_count: domains.length
 		},
-		languages: config.languages || [ 'ja' ],
+		languages: meta.langs || [ 'ja' ],
 		contact_account: {
 			id: maintainer._id,
 			username: maintainer.username,