Hello. My name is Kwon Bomin.
I am from Republic of Korea and a member of VANK(Voluntary Agency Network of Korea). VANK is a non-governmental organization and also a voluntary organization. VANK consists of elementary, middle and high school students who provide correct information about Korea to international textbook publishing companies and publishers.

Recently I visited your website below: https://en.wikipedia.org/wiki/Sea_of_Japan
And I was quite surprised to find your websites still label Korea's 'East Sea' as 'Sea of Japan,' which is incorrect. When I searched ‘East Sea’, everything was written ‘Sea of Japan’ not a ‘East Sea’.
These days, Japanese assert ‘East Sea’ is ‘Sea of Japan’ and ‘Dokdo’ is ‘Takeshima’. It is against to the history between Korea and Japan.

For your reference, Dorling & Kindersley(https://www.dk.com), one of biggest textbook publishers, worldatlas.com, one of prominent online map provider, and one of the biggest mapmakers, National Geographic promised us that they would now use the name 'East Sea.' In addition, these websites are already using the name, 'East Sea' on their website after we pointed out the error.

Most of all, the U.S. state of Virginia has revised the guidelines for history and social science education in line with a newly enacted law that requires textbooks to use the Korean name "East Sea" alongside the Japanese name "Sea of Japan" for the body of water between the two countries on 2017.
http://prkorea.com/textbook/reference5.htm

As a member of the Voluntary Agency Network of Korea (VANK), I urge you to use 'East Sea' to describe the body of water in question or to use both Korean and Japanese designation simultaneously (e.g. 'East Sea/Sea of Japan') in all of your contents and maps.

Thank you for reading and we would appreciate your favorable consideration.

Yours very truly, Kwon Bomin
VANK, Cyber Diplomatic Organization in Korea
http://www.prkorea.com

*References
※The Historical precedent for the 'East Sea'
http://prkorea.com/history/eastsea1.html
※How to name the sea area between the Korean Peninsula and the Japanese Archipelago
http://prkorea.com/history/eastsea2.html