Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/controllers/oauth/authorized_applications_controller.rb
  Two changes too close to each other
- app/controllers/settings/sessions_controller.rb
- app/lib/user_settings_decorator.rb
  Two changes too close to each other
- app/models/media_attachment.rb
  New changes too close to glitch-soc only changes.
- app/models/user.rb
  Two changes too close to each other.
- app/services/remove_status_service.rb
  Kept direct timeline code which had been removed upstream.
- app/views/settings/preferences/show.html.haml
  Two changes too close to each other.
- config/locales/en.yml
  Introduction of a new string too close to glitch-soc-only's “flavour”
- config/locales/ja.yml
  Introduction of a new string too close to glitch-soc-only's “flavour”
- config/locales/pl.yml
  Introduction of a new string too close to glitch-soc-only's “flavour”
- config/locales/simple_form.en.yml
  Introduction of a new string too close to glitch-soc-only's “skin”
- config/locales/simple_form.pl.yml
  Introduction of a new string too close to glitch-soc-only's “skin”
- config/settings.yml
  Reverted upstream's decision of enabling posting application by default.

Dockerfile

@@ -1,5 +1,5 @@
 FROM node:8.15-alpine as node
-FROM ruby:2.6-alpine3.8
+FROM ruby:2.6-alpine3.9
 
 LABEL maintainer="https://github.com/tootsuite/mastodon" \
       description="Your self-hosted, globally interconnected microblogging community"
@@ -24,19 +24,18 @@ COPY --from=node /usr/local/lib/node_modules /usr/local/lib/node_modules
 COPY --from=node /usr/local/bin/npm /usr/local/bin/npm
 COPY --from=node /opt/yarn-* /opt/yarn
 
-RUN apk -U upgrade \
- && apk add -t build-dependencies \
+RUN apk add --no-cache -t build-dependencies \
     build-base \
     icu-dev \
     libidn-dev \
-    libressl \
+    openssl \
     libtool \
     libxml2-dev \
     libxslt-dev \
     postgresql-dev \
     protobuf-dev \
     python \
- && apk add \
+ && apk add --no-cache \
     ca-certificates \
     ffmpeg \
     file \
@@ -64,7 +63,7 @@ RUN apk -U upgrade \
  && make install \
  && libtool --finish /usr/local/lib \
  && cd /mastodon \
- && rm -rf /tmp/* /var/cache/apk/*
+ && rm -rf /tmp/*
 
 COPY Gemfile Gemfile.lock package.json yarn.lock .yarnclean /mastodon/
 COPY stack-fix.c /lib