In the Japanese API documentation for 5.0, there are many untranslated description
in java.lang.StringBuffer. See the following URL for the detail.

http://java.sun.com/j2se/1.5.0/ja/docs/ja/api/java/lang/StringBuffer.html
java.lang.StringBuffer and java.lang.StringBuilder have the method description
not partially translated. See the following API doc for more detail.

http://ministop.japan/j2se/5.0/docs/apidoc/html/ja/java/lang/StringBuffer.html
http://ministop.japan/j2se/5.0/docs/apidoc/html/ja/java/lang/StringBuilder.html

The description of most methods is English even if it had been generated from
the translated cmnt files.