Description of problem:
Escape characters in error message look messy when editing membership

Version-Release number of selected component (if applicable):
v3.4.0.14

How reproducible:
Always

Steps to Reproduce:
1. Login with admin user
2. Go to "Resources" -> "Membership", click "Edit Membership"
3. Add role to user: input invalid user name "user/abc", select role "view", then click "Add"
4. Add cluster-admin to user: select the option "Show hidden roles
", input user name "bob", select "cluster-admin", click "Add"

Actual results:
Step 3 and 4, the error message includes escape characters like '"':
3.
The role "view" was not given to "user/abc".Reason: "RoleBinding "view" is invalid: [subjects[1].name: Invalid value: "user/1": name may not contain "/", subjects[2].name: Invalid value: "xxia-proj/bob*abc": must match the regex [a-z0-9]([-a-z0-9]*[a-z0-9])?(\.[a-z0-9]([-a-z0-9]*[a-z0-9])?)* (e.g. 'example.com'), subjects[3].name: Invalid value: "user/abc": name may not contain "/"]"

4.
The role "cluster-admin" was not given to "xxia12345678901234567890123456789012345678901234567890".Reason: "rolebinding "cluster-admin" is forbidden: user "xxia" cannot grant extra privileges: {Verbs:["*"], APIGroups:["*"], Resources:["*"]} {Verbs:["*"], NonResourceURLs:["*"]}"

Expected results:
3 and 4 should look well in error message.

Additional info: