It is Japanese!
To change to language back to English:
-Log into the Web GUI
-Click on the icon directly underneath "TOP" (This is the "Basic" page; the icon is a piece of paper with the corner folded).
-Change the last drop down box to "English" and press the "apply" button which is in the lower left hand corner. It can take up to 2 full minutes for the language to change, so if the page refreshes and is still not English wait a minute or two and then refresh it.
-Then go to "Basic" again and change the second to last drop down box (Windows Client Language) to "CP437 US and Canada".
If it still is not in English:
-Log into the Web GUI
-Go to the icon on the left with the wrench and screw driver (Maintenance), and click on the last sub link (Initialization).
-Then restore to factory defaults by pressing the button in the middle of the screen and type in the four digit confirmation code on the next page.
-Repeat steps above.