Fixed Japanese translations for messages 1259, 2556, 2620, 2621, 2706, and 18046

[hanohrs]

Fixes #53337

Testing

I did not add unit tests for this change because:

• Previous changes to this file have not included test additions, following the established pattern for locale-specific message updates
• I manually verified the fix by running /path/to/TypeScript/built/local/tsc.js --locale ja locally and confirmed that the expected error messages are displayed correctly

The change is a straightforward localization fix that aligns the Japanese error message with the English version, and manual testing confirms the expected behavior.

[jakebailey]

These files are maintained by our localization team and can't really be updated externally (they push them here). I don't think we can accept this PR.

[hanohrs]

I'm disappointed to hear that, as I submitted this PR because issue #53337 has a "Help Wanted" label.

I understand you can't accept this PR, but I hope the incorrect translations can still be fixed. Messages 2620, 2621, and 2706 have meanings that are opposite to what they should be. How can I help get these corrected?

[RyanCavanaugh]

Sorry for the incorrect tag on that one, I missed something there.

I'll try to track down who is in charge of the loc files these days.

[hanohrs]

@RyanCavanaugh
Thank you. I hope the translations can be fixed.

[typescript-bot]

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