feat: Render conversation custom attributes (#3065)

app/javascript/dashboard/i18n/locale/en/conversation.json

@@ -156,6 +156,27 @@
       "PREVIOUS_CONVERSATION": "Previous Conversations"
     }
   },
+  "CONVERSATION_CUSTOM_ATTRIBUTES": {
+    "ADD_BUTTON_TEXT": "Create attribute",
+    "UPDATE": {
+      "SUCCESS": "Attribute updated successfully",
+      "ERROR": "Unable to update attribute. Please try again later"
+    },
+    "ADD": {
+      "TITLE": "Add",
+      "SUCCESS": "Attribute added successfully",
+      "ERROR": "Unable to add attribute. Please try again later"
+    },
+    "DELETE": {
+      "SUCCESS": "Attribute deleted successfully",
+      "ERROR": "Unable to delete attribute. Please try again later"
+    },
+    "ATTRIBUTE_SELECT": {
+      "TITLE": "Add attributes",
+      "PLACEHOLDER": "Search attributes",
+      "NO_RESULT": "No attributes found"
+    }
+  },
   "EMAIL_HEADER": {
     "TO": "To",
     "BCC": "Bcc",