Its Jananese acrtually.
Logon into the web interface page (you will see the 2 text fields when you type the ip address into your browser and press enter)
Along the left hand side select the second option (a folded papaer icon)
The next page at comes up at the top you will see 2 text fields, modify the second one (add a "1" to the end or something)
Under time are you time and date settings (leave these as they are)
Under this are your ntp settings (you shoud be able to see "NTP" even though its in japanese) under this heading make sure the circular radio button on the right is selected.
Scroll down to the bottom of the page you you will see 2 drop down list, on the second last one select "English" and leave the last drop down list as it is (you can probably only select one option anyways)
Click the button at the end of the page and wait for the page to refresh (it might take a couple of minutes)
Once its refreshed it will still be in japanese, click the "TOP" button at the top left of the page and again wait for the page to refresh (again it might take a couple of minute)
Once its refreshed it should be in english again ;)