ref: #3538 ("Extended information" -> "About this instance") and #3519

Signed-off-by: lindwurm <lindwurm.q@gmail.com>

* Do not default the format in ProviderDiscovery

The format should be determined when discovering, as it is in the current
implementation, and it is a flaw if it is not determined.

* Spec ProviderDiscovery

* Remove some arguments of Formatter.instance.format

* Improve spec for Formatter

* Add Japanese translations (pin)

* "ピン留め" is more general

This change follows #3519, which does the same for the Chinese variants. Or should it be simply "About"?

* Allow mounting arbitrary columns

* Refactor column headers, allow pinning/unpinning and moving columns around

* Collapse animation

* Re-introduce scroll to top

* Save column settings properly, do not display pin options in
single-column view, do not display collapse icon if there is
nothing to collapse

* Fix one instance of public timeline being closed closing the stream
Fix back buttons inconsistently sending you back to / even if history exists

* Getting started displays links to columns that are not mounted

* Remove redundant status.reply? in AtomSerializer#object

* Cover AtomSerializer more

* Add redis key "subscribed:timeline:#{account.id}" to indicate active streaming API listeners exists.

* Add endpoint for notification only stream.

* Run PushUpdateWorker only for users uses Streaming API now.

* Move close hander streamTo(Http/Ws) -> stream(Http/Ws)End (Deal with #3370)

* Add stream type for stream start log message.

* zh-cn.json: "additional info" -> "more info"

This commit changes the "extended info" (about/more) text to something that translates to "more info", as "additional info" in zh can sound like appending things to the (ugh) navbar, I guess.

Or should I just change it to "about this site" (关于本站)?

* zh-cn.json: navbar.info -> "about this site"

* zh-臺灣.json: navbar.info -> "about this site"

WarmCacheService is no longer used (removed with 5442083b3c ).

This fixes #2375.

Remove protect_from_forgery in ApiController, which is disabled by the
following skip_before_action, as well.

This implementation is a bit smaller and still has the following benefits:

* No need of app/javascript/packs/custom.js
For custom stylesheet, it typically has only
"require('../styles/custom.scss')" and is redundant.

* No need to extract vendor stylesheet to another asset
Extracting vendor stylesheet could be forgotten by developers who do not
use custom stylesheet.

* Update rails to version 5.1.1

* Run `rails app:update`

* Remove the override of polymorphic activity relationship

* Silence warning about otp_secret attribute being unknown to rails

* We will only introduce form_with where we want to use remote data

* Add failing specs for hashtag and username extraction in language detector

* Remove usernames and hashtags from text before language detection

* Handle multiple instances of special case, and reduce whitespace

Focus the submit button when boost modal is opened.

* Remove trailing whitespace in i18n mailers

* Use query methods instead of #present? on AR attributes

* Delegate Status#account_domain method

* Delegate Mention #account_username and #account_acct methods

* Move specs for account finder methods to concern spec

* Move account finder methods to concern

* Improve spec wording

* Use more explicit comparison to ensure correct return value

* Add coverage for .find_local! and .find_remote!

* Add some methods to the finder

* Use arel on matching_username method

* Avoid ternary in matching domain method

* Simplify finder methods

* Use an AccountFinder class to simplify lookup

* Update zh-TW.json

* Update `search_results.total`

* Remove react-imageloader

* add eslint-disable-line

* improve image loading experience

* remove unneeded import

* use PureComponent

* Use componentWillMount instead of constructor

This prevents `next` state from being overridden on the loading *new* statuses.

* Add Catalan language

* Add Catalan language

* Update ca.json

* Update ca.json

* Update ca.json

* Update ca.json

* Update ca.json

* Update ca.json

* Update settings_helper.rb

* Update mastodon.js

* Update index.js

* Update application.rb

* Update ca.yml

* removed extra spaces at line 225

* Catalan translation update

added activerecord.ca.yml

* Update activerecord.ca.yml

Done

* Updated activerecord.ca.yml

* Catalan language updated

* Catalan language updated

* Catalan language updated

* Catalan language updated

* Catalan language updated

* Change PureComponent to ImmutablePureComponent

Change PureComponent to ImmutablePureComponent in AttachmentList.

* rm React.