Refactor the database logic for the apps into it's own mixin for reuse

langs/en-ca.json

@@ -22,7 +22,7 @@
 		"notifs": {
 			"error": {
 				"db-out-of-date": "Database out of date, please try again.",
-				"artist-ID-404": "An artist cannot be found with ID: {id}"
+				"document-ID-404": "Cannot find {dbType} with ID: {id}"
 			}
 		}
 	}