Update Japanese translation (#3734)
* Remove old old onboarding related entries
cf. https://github.com/bluesky-social/social-app/pull/3674
* Update Japanese translation
(accessibilityLabel & accessibilityHint)
cf. https://github.com/bluesky-social/social-app/pull/3670
* Update Japanese translation
* Fix Japanase translation related to block
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