East Asian characters support check

Some pages on the site contains Japanese text. They have this information box in the right upper corner:

This article contains Japanese text.
Without proper rendering support,
you may see question marks, boxes or other symbols instead of hiragana, kanji or katakana.

You will need rendering support for proper viewing of those pages.

Check for existing support

Below you can see the Japanese writing for Kyattou Ninden Teyandee. If you see boxes, question marks or meaningless letters mixing in the text you don`t have support for East Asian characters:

キャッ党忍伝てやんでえ

Compare it to this picture of what it should look like:

Instructions

See Wikipedia