• Refine translation.
• Use preferred translation spelling.
• KDE2 -> KDE.
• Add single space before/after quote element.
• Whitespace cleanup, and rewrap lines.

Submitted by: Hiroo Ono <hiroo _at_ jp dot FreeBSD dot org>, ryusuke
Reference: [doc-jp-work 1799, 1800, 1990]

Approved by: hrs (mentor)