i18n(ja): japanese translate for top page

[penginnu]

Description

• Added Japanese translation for the top page.

Note

• This is a duplicate of the PR i18n(ja): "Quick Start" Section #3111 , but is submitted because it was translated separately. You can have them integrated.
• I have confirmed in PR i18n(ja): "Quick Start" Section #3111 that the directory is changed from jp to ja, but we have created the directory as jp for confirmation.

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[vasfvitor]

from jp to ja, but we have created the directory as jp for confirmation
It should be ja, it's now updated on the main repo. Thanks.

This is a duplicate of the PR

I'll see what can be done

Thanks again