(Bloomberg Opinion) — It turns out that Japan can do more than just tidy up the stadiums. They gave a good cleaning to Spain and Germany, too.Even after their shock Group E opener in defeating a four-time World Cup champion 2-1, coverage of Japan’s exploits in Qatar had fallen back on a slightly patronizing focus: their off-field activities — in particular, the habit of both the team and the fans to clean the dressing rooms or stadi…