Update ja.js for #296

Threaded mode~

Fix search popout

max_toot_chars is present in the root of the initial state object.
(Previously, we were trying to read it from the meta child object.)

Web push updates

unique ColumnLink keys in getting_started

Compose refactor

Fixes #6197.

i18n: 🇵🇱

* Create email_changed.oc.html.erb

* Create email_changed.oc.text.erb

* Update email_changed.oc.html.erb

* Update email_changed.oc.html.erb

* Create reconfirmation_instructions.oc.html.erb

* Create reconfirmation_instructions.oc.text.erb

* Update confirmation_instructions.oc.html.erb

* Update confirmation_instructions.oc.text.erb

* Update confirmation_instructions.oc.html.erb

* Update reconfirmation_instructions.oc.html.erb

* Update reconfirmation_instructions.oc.text.erb

* Update reconfirmation_instructions.oc.html.erb

A change introduced in #6125 prevents
`Devise::Models::Confirmable#confirm` from being called for existing
users, which in turn leads to `email` not being set to
`unconfirmed_email`, breaking email updates. This also adds a test
that would've caught this issue.

Migration is wrapped by transaction, so manual `commit_db_transaction` without transaction restarting causes "there is no transaction in progress" warnings. We should use `disable_ddl_transaction!` instead, if we can omit transaction completely.

As a screen reader user new to Mastodon, I encountered the following issues with the column headers as designed:
 * Jumping between them was difficult. FOr instance, passing my home timeline to reach notification settings was difficult to impossible, especially considering infinite scrolling.
 * There doesn't appear to be any means for triggering the control via the keyboard. the `titleClick` handler only responds to mouse clicks.
 * I didn't even realize there was a Settings toggle until I made this change.

Thanks for using ARIA in your designs. It's a huge help. But adding a `button` role doesn't add keyboard handling and other button behavior. Also, because the role was on the heading container, it obscured the controls within the container itself. This fix resolve that. It also exposes the headings as headings rather than buttons, enabling skipping columns by using screen readers' heading navigation commands.

Since I myself am blind, if this fix requires additional visual styling, I'd like help applying that so it can be merged. I'd consider it an essential accessibility fix for my and other blind users' existence on the platform. Thanks!

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>