Ensure the only allowed author of top-level entries in feed is the person
the feed belongs to (a verified user). Ensure delete events only apply
if the deleted item belonged to that user.

* Togglable filter links

* Rename is_selected to selected?

The old implementation sets default From address in mailers. It sets
the address from SMTP_FROM_ADDRESS, or notifications@localhost. The
behavior is occasionally undesired results.

In production environment, notifications@localhost is likely to be
incorrect.
In testing environment, the email address should not be varied by a
environment variable.

After appling this change,

In production environment, it will throw an exception when launching
Mastodon.
In testing environment, the address will be fixed with
notifications@localhost.

* add a system_font_ui setting on the server

* Plug the system_font_ui on the front-end

* add EN/FR locales for the new setting

* put Roboto after all other fonts

* remove trailing whitespace so CodeClimate is happy

* fix user_spec.rb

* correctly write user_spect this time

* slightly better way of adding the classes

* add comments to the system-font stack for clarification

* use .system-font for the class instead

* don't use multiple lines for comments

* remove trailing whitespace

* use the classnames module for consistency

* use `mastodon-font-sans-serif` instead of Roboto directly

* Update links in status content on update as well as mount
Fixes occasional bugs with mentions and hashtags not being set to open in a new column like they should, and instead opening in a new page

* use classList instead of raw className

This fixes a warning on status unmounting (e.g. deletion).

This also resets IntersectionObserverWrapper on disconnect to avoid `unobserve()` calls
which has bug in Edge.

* Small adjustments

About the report part.

* Update time format

* Fix embedded SVG fill attribute

SCSS darken/lighten functions may not return a color value, but a color
name like "white".  See following example:

https://www.sassmeister.com/gist/c41da93b87d536890ddf30a1f42e7816

This patch will normalize $color argument to FFFFFF style.

I also changed the function name from "url-friendly-colour" to
"hex-color", Because...

1. The name "url-friendly" is not meaningful enough to describe what it
   does.

2. It is familier to me using "color" rather than "colour"

    kojima:kojiMac mastodon[master]$ git grep -l colour
    app/javascript/styles/boost.scss
    spec/fixtures/files/attachment.jpg

    kojima:kojiMac mastodon[master]$ git grep -l color
    .rspec
    .scss-lint.yml
    Gemfile.lock
    app/javascript/mastodon/features/status/components/action_bar.js
    app/javascript/styles/about.scss
    app/javascript/styles/accounts.scss
    app/javascript/styles/admin.scss
    app/javascript/styles/basics.scss
    app/javascript/styles/boost.scss
    app/javascript/styles/compact_header.scss
    app/javascript/styles/components.scss
    app/javascript/styles/containers.scss
    app/javascript/styles/footer.scss
    app/javascript/styles/forms.scss
    app/javascript/styles/landing_strip.scss
    app/javascript/styles/reset.scss
    app/javascript/styles/stream_entries.scss
    app/javascript/styles/tables.scss
    app/javascript/styles/variables.scss
    app/views/admin/subscriptions/_subscription.html.haml
    app/views/layouts/application.html.haml
    app/views/layouts/error.html.haml
    app/views/manifests/show.json.rabl
    bin/webpack-dev-server
    config/initializers/httplog.rb
    public/500.html
    public/emoji/1f1e6-1f1e8.svg
    public/emoji/1f1ec-1f1f8.svg
    public/emoji/1f1f3-1f1ee.svg
    public/emoji/1f1fb-1f1ec.svg
    spec/fixtures/requests/idn.txt
    yarn.lock

* Add semicolon

* i18n: minor changes in Polish translation

* Update pl.json

* Added Korean Translation (based on japanese)

* Update korean translation

* Update korean translation: fix syntax error

* Updated korean translation

* Update korean translation

* Update ko.json

Translate non-translated parts

* Update ko.yml

Translated missed parts - and fixed some typos

* Create simple_form.ko.yml

* Update simple_form.ko.yml

Translation error fix - password change form

* Update simple_form.ko.yml

* Update ko.json

Missing translation

* Added Korean Translation (based on japanese)

* Update korean translation

* Update korean translation: fix syntax error

* Updated korean translation

* Update korean translation

* Update ko.json

Translate non-translated parts

* Update ko.yml

Translated missed parts - and fixed some typos

* Create simple_form.ko.yml

* Updated korean translation

* i18n: fix test fails

In from_redis method, statuses retrieved from the database was mapped to
the IDs retrieved from Redis. It was equivalent to order from high to low
because those IDs are sorted in the same order.
Statuses are ordered with the ID by default, so we do not have to reorder.
Sorting statuses in the database is even faster since the IDs are indexed
with B-tree.

* add missing locales for French translation

* accent "Media" in the front-end locales

* images => médias

* Change 'rapport' to 'signalement' in French locales to be more coherent

* fix typo

* remove duplicate EN locale

* translate missing locales

* update missing locale

* fix typo

* unify with "utilisateur⋅ice⋅s"

* address PR comments

* Faster emojify() algorithm, avoid regex replace

* add semicolon

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

* Use instance name in "password changed" mail

instead of "Mastodon".

Fixes tootsuite#2620.

* Use instance name in password reset mail

instead of "Mastodon".

* feat(components/media_gallery): Responsive images

* fix(components/media_gallery): Link to image URL

* Fix #3910 - Require OTP authentication to disable 2FA. Also, remove ability
to generate new OTP backup codes *after* initial backup codes were handed
out during activation

* Restore recovery code re-generation

* Improve display of some 2FA elements