Merge branch 'webpack-4-dart-sass' into 'develop'

.eslintrc.js

.gitlab-ci.yml

build/utils.js

build/webpack.base.conf.js

build/webpack.dev.conf.js

build/webpack.prod.conf.js

package.json

src/App.scss

src/components/login_form/login_form.vue

src/components/post_status_form/post_status_form.vue

src/components/settings/settings.vue

src/components/status/status.vue

src/i18n/compare

test/unit/index.js

test/unit/karma.conf.js

test/unit/specs/components/user_profile.spec.js

...it/specs/services/gesture_service/gesture_service.spec.js

yarn.lock