Added more missing localization, added LocalizationChecker tool, moved CriticalCSSGenerator to tools folder

src/Server/Tools/CriticalCSS/README.md

@@ -0,0 +1,11 @@
+# How to use CriticalCSS
+1. Install it here
+```bash
+npm i -D critical
+npm install puppeteer
+```
+2. Run the css generator:
+```bash
+node CriticalCSSGenerator.js
+```
+3. Move the `.css` files from the current directory to the `CriticalCSS/` folder (overwrite existing files)