Merge the following from the English version:

1.138 -> 1.139 ja_JP.eucJP/books/handbook/introduction/chapter.sgml
1.489 -> 1.490 ja_JP.eucJP/books/handbook/mirrors/chapter.sgml
1.137 -> 1.139 ja_JP.eucJP/books/handbook/multimedia/chapter.sgml
1.290 -> 1.291 ja_JP.eucJP/books/handbook/ports/chapter.sgml
1.204 -> 1.205 ja_JP.eucJP/books/handbook/x11/chapter.sgml