Japanese file updates

[lavender-snow]

Japanese file has been updated.

[johnshaughnessy]

This seems to have slipped through the cracks and could have been merged ages ago. Sorry for the delay and thank you for the submission!

New keys have been added since the original submission. I will list them here for anyone who may be able to complete them:

banner.celebrate-alt
banner.email-address
banner.error-body
banner.error-cta
banner.error-title
banner.expand-body
banner.expand-body-two
banner.expand-cta
banner.expand-title
banner.form-cta
banner.form-decline
banner.format-html
banner.format-label
banner.format-text
banner.subtitle
banner.success-cta
banner.success-message
banner.success-title
banner.title
banner.warning-alt
chat-sidebar-container.input-send-button.disabled
chat-sidebar.moderator-message.text-chat-disabled
chat-sidebar.moderator-message.text-chat-disabled-mod
chat-sidebar.moderator-message.text-chat-enabled
chat-sidebar.moderator-message.voice-chat-disabled
chat-sidebar.moderator-message.voice-chat-disabled-mod
chat-sidebar.moderator-message.voice-chat-enabled
content-menu.ecs-debug-menu-button
ecs-sidebar.log-button
ecs-sidebar.refresh-icon
header.labs
mic-setup-modal.title-audio
mic-setup-modal.voice-chat-disabled
preferences-screen.aa-mode.msaa_2x
preferences-screen.aa-mode.msaa_4x
preferences-screen.aa-mode.msaa_8x
preferences-screen.aa-mode.none
preferences-screen.aa-mode.smaa
preferences-screen.category.graphics
preferences-screen.preference.enable-fx
preferences-screen.preference.enable-fx-bloom
preferences-screen.preference.enable-fx.tooltip
preferences-screen.preference.fx-aa-mode
reaction-popover.action
reaction-popover.hand-raised-warning
reaction-popover.lower-hand
reaction-popover.raise-hand
record-mode-enabled-tip
room-settings-sidebar.description-placeholder
room-settings-sidebar.text-chat
room-settings-sidebar.voice-chat
twitter-oauth-modal.title
voice-button-container.title

[johnshaughnessy]

Recreated this PR just so that the automated tests run before merge. #5832