Found a plausible translation:

http://www.flickr.com/photos/kernbeisser/8185657841/in/set-72157631890939012

자력갱생만이 살길이다! “Self-reliance is the only way to live!”

If you want to check an area out closer you can push the button in the top right of the map (looks like three layers on top of each other) and check the alternative “Browse Map Data”.

This enables you to click on areas and ways in the map to see what tags they have. In this case it is: landuse=military military=danger_area

歯医者は amenity=dentist。雑貨屋は多分 shop=general。http://wiki.openstreetmap.org/wiki/JA:Tag:shop%3Dgeneral