Translate en.json in cs

99% of minimum 80% translated source file: 'en.json'
on 'cs'.

Sync of partially translated files: 
untranslated content is included with an empty translation 
or source language content depending on file format

apps/web-mzima-client/src/assets/locales/cs.json

@@ -302,7 +302,7 @@
     },
     "task_is_marked_as": {
       "not_completed": "Úkol splněn? - Použijte přepínač níže",
-      "completed": "You have marked \"{{taskName}}\" Task as Completed!"
+      "completed": "Označili jste \"{{taskName}}\". Úkol jako splněný!"
     },
     "delete_task": "Smazat úlohu",
     "duplicate_survey": "Duplikovat",