feat: Czech and Slovak translations (#439)

Add Czech and Slovak translations

Co-authored-by: Michal Hudeček <[email protected]>
Co-authored-by: Cassidy Williams <[email protected]>
Co-authored-by: Kristy Marcinova <[email protected]>

Author: 4 people

README.md

@@ -157,8 +157,7 @@ module API. Options include:
   container: '#some-query-selector'; // container to attach to
   APIUrl: 'https://www.example.com/.netlify/functions/identity'; // Absolute url to endpoint.  ONLY USE IN SPECIAL CASES!
   namePlaceholder: 'some-placeholder-for-Name'; // custom placeholder for name input form
-  locale: 'en'; // language code for translations - available: en, fr, es, pt, hu, pl - default to en
-}
+  locale: 'en'; // language code for translations - available: en, fr, es, pt, hu, pl, cs, sk - default to en
 ```
 
 Generally avoid setting the `APIUrl`. You should only set this when your app is