When we build XCL by Japanese, all messages are shown as Japanese.
And when I change the using language in general configuration, text in textareas turns completely unreadable. I can stand and understand it. But I hope Module names in block administration should be readable in other language, so give us a dirname of module in additional.
And if more favor is allowed, when change back to Japanese language from the other language mode, we lose site subtitle, guest name and reasons of site close by transforming character. So purge 'using language' from general configuration (link config category 7?).