Japanese translation of the front page

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Improve Japanese translation of the front page

Signed-off-by: KATOH Yasufumi <karma@jazz.email.ne.jp>
Merge pull request #4 from tenforward/japanese

Translate the front page into Japanese
Remove the pronounciation

It seems to mostly confuse people and doesn't translate well.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>