[ja] fix japanese content into right meaning.

[zigzagdev]

Supersedes #473

Description

• before text is wrong in japanese grammer. So, i fixed it.
• And i opened the same PR before, but i made a mistake in before PR. So, i open the new one.

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[kenjis]

LGTM!

[zigzagdev]

@kenjis

Hi!🙌

Thanks to reviewing my PR.
But some github actions are failed. Is there anything to do for me about it??

[kenjis]

This PR has no problem.

"code style / Code Style Check" fails because some code has been invalid style. Probably cs-fixer rules are updated.
If you want to fix the checks, please send another PR for it.