[CORL-360] Embrace CSS Variables (#2312)

* fix: docz bug

* feat: implement css variables

* fix: adapt docz

* fix: webpack config

* fix: add ui l10n bundle to tests

package.json

@@ -135,6 +135,7 @@
     "@babel/polyfill": "^7.4.4",
     "@babel/preset-env": "^7.4.4",
     "@babel/preset-react": "^7.0.0",
+    "@babel/preset-typescript": "^7.3.3",
     "@coralproject/rte": "^0.10.13",
     "@intervolga/optimize-cssnano-plugin": "^1.0.6",
     "@types/basic-auth": "^1.1.2",
@@ -155,6 +156,7 @@
     "@types/enzyme-adapter-react-16": "^1.0.3",
     "@types/eventemitter2": "^4.1.0",
     "@types/express": "^4.16.0",
+    "@types/flat": "0.0.28",
     "@types/fs-extra": "^5.0.4",
     "@types/graphql": "^0.13.3",
     "@types/html-minifier": "^3.5.2",
@@ -210,6 +212,7 @@
     "@types/webpack-dev-server": "^3.1.5",
     "@types/ws": "^5.1.2",
     "acorn": "^6.1.1",
+    "ansi-styles": "^3.2.0",
     "autoprefixer": "^9.5.1",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^23.6.0",
@@ -271,6 +274,7 @@
     "postcss-flexbugs-fixes": "^4.1.0",
     "postcss-font-magician": "^2.2.1",
     "postcss-import": "^11.1.0",
+    "postcss-js": "^2.0.1",
     "postcss-loader": "^3.0.0",
     "postcss-mixins": "^6.2.1",
     "postcss-nested": "^4.1.1",