This will reduce requests on who have only few statuses.

- Use next link header to detect more items from first request
- Omit next link header if result items are fewer than requested count
(It had omit it only if result was empty before)

* @object is not needed

* Remove unneeded dependencies

* Do not call private method

* Prefer #respond_to_missing? over #respond_to?

`#respond_to?` doesn't support `User.settings.method(:method_name)`

* Use find_or_initialize_by instead of

* Fixes translation placeholder

* Translates onboarding page

* Add load more button for large screens
* Fix `next` state value on the first loading
* Don't load if `isLoading || !hasMore`
* Start load on near the bottom

Since long lines may overflow and cause the status-list horizontally scrollable,
I added `overflow: hidden` to placeholder contents to prevent it.

* refactor(components/status_list): Lazy load using IntersectionObserver

* refactor(components/status_list): Avoid setState bottleneck

* refactor(components/status_list): Update state correctly

* fix(components/status): Render if isIntersecting is undefined

* refactor(components/status): Recycle timeout

* refactor(components/status): Reduce animation duration

* refactor(components/status): Use requestIdleCallback

* chore: Split polyfill bundles

* refactor(components/status_list): Increase rootMargin to 300%

* fix(components/status): Check if onRef is not defined

* chore: Add note about polyfill bundle splitting

* fix(components/status): Reduce animation duration to 0.3 seconds

Resolve #3270

Link headers in following/followers API should include follow_id as max_id/since_id.

However, these API use current_user's account_id instead of follow_id from #3167.
This causes irrelevant result on loading more users.

(You may think that we need account deletions, but this way would've just orphaned the db records)

- Increase coverage to exercise all parts of each action
- Move into namespace to share common code
- Misc refactor of each action for smaller methods, simpler code

* Cover StreamEntriesController more

* Remove redundant instructions in StreamEntriesController

Introduce recent to Follow, as Account and other models have.
This change also adds specs for the scope and the dependents.

Focus the submit button when confirmation modal is opened.

Also, changed cancellation link to button.
This makes the meaning clearer.

original: https://github.com/tootsuite/mastodon/pull/2618

* Introduce recent scope to Status and StreamEntry

Introduce recent scope to Status and StreamEntry as Account has.

* Cover AccountsController more in AccountsController

* Add spec files for feed and media cleanup workers

* Add coverage for feed and media cleanup schedulers

* Clean up feed and media cleanup workers

so that public timeline/caching would not encounter incomplete data

* Add Russian translation (ru)

* Fix a missing comma

* Fix the wording for better consistency

* Update Russian translation

* Arrange Russian setting alphabetically

* Fix syntax error

* Update Russian translation

* Fix formatting error

* Update Russian translation

* Update Russian translation

* Update ru.jsx

* Fix syntax error

* Remove two_factor_auth.warning (appears obsolete)

* Add missing strings in ru.yml

A lot of new strings translated, especially for the newly added admin section

* Fix translation consistency

* Update Russian translation

* Update Russian translation (pluralizations)

* Update Russian translation

* Update Russian translation

* Only load Intl data for current language

* Extract common chunk only from application.js and public.js

* Generate locale packs, avoid caching on window object

This change also adds a specification for the method.

ref #3101

* Persian translation update

* Persian translation update: new files

* Persian translation update

* activerecord.fa.yml language code

* Persian translation update

* fix indent