Follow up #2902

* Fix regressions from #2683

Properly format spoiler text HTML, while keeping old logic for blankness intact
Process hashtags and mentions in spoiler text
Format spoiler text for Atom
Change "show more" toggle into a button instead of anchor
Fix style regression on dropdowns for detailed statuses

* Fix lint issue

* Convert spoiler text to plaintext in desktop notifications

* Very small fix/update NL strings

* Oops

* Add specs for valid challenge response from pubsub confirmation worker

* Refactor the pubsub confirmation worker

that caused user pages to break when showing toots with CWs

* Spec for feed insert worker when missing records

* more specs!

* Refactor feed insert worker

Vorbis is audio format of Open Source.
Can play audio in a free environment where you can not play mp3.

* Fix the pluralRuleFunction of the locale data.
* Added more descriptions about how to write it.

According to the release message:
> Fix for macOS and minor improvements

* services: scan spoiler_text for hashtags (#699)

* views: link hashtags from spoiler_texts

This covers linking hashtags from within the spoiler
text on the server-generated pages.

* services: fix string concat going into hashtag RE

Cleaner Ruby syntax, may handle immutable strings better

to all subscribers. IDN-normalize callback URLs for subscriptions on insert.

* Add spec for pubsubhubbub/subscribe

* Refactor pubsubhubbub/subscribe service

* Add coverage for pubsub unsubscribe service

* Refactor pubsub unsubscribe service

Compact Language Detector v3 (CLD3) is the successor of CLD2, which was
used in the previous implementation. CLD3 includes improvements since CLD2,
and supports newer compilers. On the other hand, it has additional
requirements and cld3-ruby, the FFI of CLD3 for Ruby, is still new and may
be still inmature.

Though CLD3 is named after CLD2, it is implemented with a neural network
model, different from the old implementation, which is based on a Naïve
Bayesian classifier.

CLD3 supports newer compilers, such as GCC 6. CLD2 is not compatible with
GCC 6 because it assigns negative values to varibales typed unsigned.
(see internal/cld_generated_cjk_uni_prop_80.cc) The support for GCC 6 and
newer compilers are essential today, when some server operating system
such as Ubuntu Server 16.10 has GCC 6 by default.

On the one hand, CLD3 requires C++11 support. Environments with old
compilers such as Ubuntu Server 14.04 needs to update the system or install
a newer compiler.

CLD3 needs protocol buffers as a new dependency. However,it is not
considered problematic because major server operating systems, CentOS and
Ubuntu Server provide them.

The FFI cld3-ruby was written by me (Akihiko Odaki) for use in Mastodon.
It is still new and may be inmature, but confirmed to pass existing tests.

ExtractTextWebpackPlugin extracts the content of loaded files, which means
it loads files loaded by require.context but not required after that.
However the former implementation is not aware of that.

require.context can have a RegExp to filter files to load. This change
gives a RegExp which matches with SCSSes with 'custom' prefix to
require.context to take advantage of the feature.

* add content-type in pubsubhubhub request header

* fix type

* Remove jquery-ujs

* fix for eslint

* Update Norwegian translations

* Updated no.json
* Updated activerecord.no.yml
* Updated no.yml
* Updated simple_form.no.yml

* i18n: fix Unicode character error in no.yml

* Javascript escaping code "\uD83D\uDC18" should be "\U0001f418" in
Ruby / yml

* i18n: remove unused keys in Norwegian translation

* Remove unused keys in no.yml and activerecord.no.yml
  by running: `bundle exec i18n-tasks remove-unused no`

* Add missing keys in activerecord.no.yml and no.yml by
  running: `bundle exec i18n-tasks add-missing no`

* i18n: escape the key 'no' in activerecord.no.yml

* Add specs for unsubscribe service

* Fix non existent methods in unsubscribe service

* Clean up status handling in subscribe service

* Coverage for api push controller

* Refactor the api/push controller

* Create reset_password_instructions.oc.html.erb

* Create reset_password_instructions.oc.text.erb

* Create password_change.oc.html.erb

* Create password_change.oc.text.erb

* Create confirmation_instructions.oc.html.erb

* Create confirmation_instructions.oc.text.erb

* Update nl

* Update nl

* Update nl

* Create confirmation_instructions.nl.html.erb

* Create confirmation_instructions.nl.text.erb

* Create password_change.nl.html.erb

* Create password_change.nl.text.erb

* Create reset_password_instructions.nl.html.erb

* Create reset_password_instructions.nl.text.erb

* Update bundler-audit to version 0.5.0

* Update oj to version 3.0.6

* Update http-form_data to version 1.0.2

* Update parallel to version 1.11.2

* Update rails-i18n to version 5.0.4

* Update rack-protection to version 2.0.0

* Update haml to version 5.0.1

* Update scss_lint to version 0.53.0

* Relax requirement on i18n-tasks

* Remove haml and haml_lint gem requirement

* Update fr.json

Updating some missing french translations.

* Update fr.json

Fix repetition in line 41.

* Update fr.json

Fix : adding space between {name} and ? question mark.

* Prevent selection of unacceptable Content-Type files

* replace hard code

* media_attachments accept content-types in initial state

* Update simple_form.ar.yml

Added missing strings that were introduced to simple_form.ar.yml and completing translation.

* Create confirmation_instructions.ar.html.erb

* Create confirmation_instructions.ar.text.erb

* Create password_change.ar.html.erb

* Create password_change.ar.text.erb

* Create reset_password_instructions.ar.text.erb

* Create reset_password_instructions.ar.html.erb

- Updates scss variables file to use better-named variables for black/white/etc
- Arranges the "mastodon classic" colors into variables
- Remove all references to `$color-*` naming, replacing with new

This does not in itself introduce "theme" support, but:

- It would probably be easier to start working on theme support after this
  change and others
- Even without the goal of themes, these changes make it more clear how the
  colors are being used.

There is almost definitely some edge case in here where I've guessed the
intent/context of some color usage incorrectly, but it still seems like a net
improvement.

* Updated Thai language

* locale: remove unused translation in Thai

* locale: add Thai to settings menu and application

* locale: fix activerecord.th.yml format

Fixes #2905

* add haml_lint to Gemfile

* add .haml-lint.yml

* fix warnings of haml_lint