Fix readme of cs_CZ locales

README.rst

@@ -162,7 +162,7 @@ Set system locales:
         locale:
           en_US.UTF-8:
             default: true
-          cs_CZ.UTF-8:
+          "cs_CZ.UTF-8 UTF-8":
             enabled: true
 
 Kernel

tests/pillar/system.sls

@@ -75,5 +75,5 @@ linux:
       en_US.UTF-8:
         enabled: true
         default: true
-      cs_CZ.UTF-8:
+      "cs_CZ.UTF-8 UTF-8":
         enabled: true