Remove condition operators which are not supported by backend api (#989)

* Remove operators '[] in', '[ starts with' and '] ends with' from
frontend since backend doesn't support them for now.

public/locales/en/translations.json

@@ -82,9 +82,6 @@
       "LT": "< Less than",
       "GE": ">= Greater than/equal",
       "LE": "<= Less than/equal",
-      "[]": "[] In",
-      "[": "[ Starts with",
-      "]": "] Ends with",
       "Number": "Number",
       "Text": "Text"
     }

src/components/app/flyouts/manageDeviceGroups/views/deviceGroupForm.js

@@ -34,7 +34,7 @@ const newCondition = () => ({
   key: conditionKey++ // Used by react to track the rendered elements
 });
 
-const operators = ['EQ', 'GT', 'LT', 'GE', 'LE', '[]', '[', ']'];
+const operators = ['EQ', 'GT', 'LT', 'GE', 'LE'];
 const valueTypes = ['Number', 'Text'];
 
 class DeviceGroupForm extends LinkedComponent {