rename czech republic to czechia

Author: GDSNewt

lib/data/countries.yml

@@ -215,8 +215,8 @@
   slug: cyprus
   content_id: d35026df-3ea6-452e-870b-71bdfb7cf73e
   email_signup_content_id: 0e18d148-9ec3-4694-8d3d-5783bbdac399
-- name: Czech Republic
-  slug: czech-republic
+- name: Czechia
+  slug: czechia
   content_id: b5e5c48e-dac9-4443-a7cc-8042ccdf8404
   email_signup_content_id: 14303daa-ff18-4cdb-bd07-d81ce5ae78ea
 - name: Democratic Republic of the Congo