You can decode the Unicode chars in shell by surrounding your CURL command with, echo -en "$(curl URL)"

Example;

Curl command not surrounded with echo -en “$()”

curl --silent --header "Accept: application/json" -u admin:password http://localhost:8085/objects/TEST/SUBSCRIPTION/.*/SELECTOR

$ curl --silent --header "Accept: application/json" -u admin:password http://localhost:8085/objects/TEST/SUBSCRIPTION/.*/SELECTOR
{
  "queryTime": 0,
  "objects": [
    {
      "messageBrokerName": "TEST",
      "objectName": "TestSub",
      "objectType": "SUBSCRIPTION",
      "entryTime": "28/05/2018 11:07:57 AM",
      "fields": {
        "SELECTOR": "EAI_method \u003d \u0027notifyStatusChange\u0027 AND EAI_mandant \u003d \u0027000\u0027 AND EAI_routingCode LIKE \u0027%O%\u0027"
      }
    }
  ]
}

Same curl command surrounded with echo -en “$()”

$ echo -en "$(curl --silent --header "Accept: application/json" -u admin:password http://localhost:8085/objects/TEST/SUBSCRIPTION/.*/SELECTOR)"

$ echo -en "$(curl --silent --header "Accept: application/json" -u admin:password http://localhost:8085/objects/TEST/SUBSCRIPTION/.*/SELECTOR)"
{
  "queryTime": 0,
  "objects": [
    {
      "messageBrokerName": "TEST",
      "objectName": "TestSub",
      "objectType": "SUBSCRIPTION",
      "entryTime": "28/05/2018 11:06:27 AM",
      "fields": {
        "SELECTOR": "EAI_method = 'notifyStatusChange' AND EAI_mandant = '000' AND EAI_routingCode LIKE '%O%'"
      }
    }
  ]
}