improve Japanese translation for 5.9

[h1data]

Description

Improving Japanese localization for 5.9
Resolves: #19438

Type of change

• Translations

How Has This Been Tested?

• Compiled *.mo file by gettext and checked the appearance of the built application.

Test Configuration:

• Operating System: Windows 11

Checklist:

• I have read the Contribution guide

[h1data]

@wawanbreton Here is the Japanese translation updated for 5.9.

Our changes in #19473 were reverted in 546df30,
so I updated the changes again with additional corrections since #19473.
Lokalize folks might have only applied template *.pot files except revised *.po files.
Could you inform them about the translation changes?

[wawanbreton]

Thanks ! I'll take a look at the PR quickly.

Could you inform them about the translation changes?

Not really, I am not in direct contact with the translators. However I am the one running the procedure to send the labels to be translated. This procedure is still being debugged, so maybe there is still something wrong with it. Or maybe I just got confused because your PR arrived at the same time as the translations and I did something wrong.

[wawanbreton]

Looks good, as far as I can read Japanese, which is very close to 0 😆
Just one question about keyboard shortcuts.