Update ja interwiki links
Created by: kusakata
The Japanese wiki moved from "wiki.archlinuxjp.org" to "wiki.archlinux.jp".
Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
Created by: kusakata
The Japanese wiki moved from "wiki.archlinuxjp.org" to "wiki.archlinux.jp".