Currently, private / direct posts via OStatus from AP compatible instance will be dropped due to failing to fetch AP version.

So this fallbacks to OStatus handling:

* when failed to fetch ActivityPub version
* when status is neither :public nor :unlisted

* Don't process ActivityPub payload if signature is invalid

* Fix style issue

* Guarantee Subscription service first account has proper URL details

Subscription Service potentially could break if the first user suspended
themselves, creating a situation where the urls that populate throughout
subscription service's PuSH request would cause the remote API to throw 503 errors.

Guaranteeing that the first account picked is not suspended prevents this problem.

* Fix style issue

* Embed modal

* Proxy OEmbed requests from web UI

* Forward ActivityPub creates that reply to local statuses

* Fix test

* Fix wrong signers

* Add close tag of iframe for oEmbed response

* add comma

- Use statuses controller for embeds instead of stream entries controller
- Prefer /@:username/:id/embed URL for embeds
- Use /@:username as author_url in OEmbed
- Add follow link to embeds which opens web intent in new window
- Use redis cache in development
- Cache entire embed

Requires moving Atom rendering from DistributionWorker (where
`stream_entry.status` is already nil) to inline (where
`stream_entry.status.destroyed?` is true) and distributing that.

Unfortunately, such XML renderings can no longer be easily chained
together into one payload of n items.

Commit 9d1f8b9d scrolls the columns area
when the route changes since the user is likely to want to see the
rightmost column in such cases.

However, redirection is automatic and does not indicate users' intension.
Do not scroll the columns area due to one.

* Adjust "signed in as" pages


Fix min-width


Set width of .account-header .name

To apply text-overflow and overflow settings
Set overflow for detailed-status__display-name

* Remove trailing whitespace

* Adjust account-grid in public profiles

Full-width card on mobile UI. Set break-word for long name and ID. Fix margin.

* Reduce padding-bottom of public profiles

* Revive next prev buttons in mobile public profiles

In followers followees pages.

* Revert break-word for username

* Fix overflow of display_name

Need re-setting text-overflow and overflow in display: block;

Add japanese translations for pin_errors.

SerializarbleResource#as_json serializes to Symbol keyed Hash, but current
implementation of LinkedDataSignature expects String keyed Hash.

So it generates broken payload.

For some languages publish translation is long.

* Add handling of Linked Data Signatures in payloads

* Add a way to sign JSON, fix canonicalization of signature options

* Fix signatureValue encoding, send out signed JSON when distributing

* Add missing security context

Added new translations of error messages, block and mute domains and users, privacy disclaimers, etc (#4700)

* Added new translations of error messages, block and mute domains and users

* Added new translations of error messages, block and mute domains and users

Remove ! from compose_form.publish

* Allow multiple pinned statuses to be shown and make them be ordered by pinned date

* Set timestamps NOT NULL

* Make single-line pinned_statuses

* Spec for pinned_statuses

* Remove redundant empty line

* Adjust about.scss

* Delete trailing whitespace.