Comment 9 for bug 1616357

I digged more and found that no translation files exist for neutron_lib.

Another example:

the explanation message while giving invalid gateway is partially hard-coded. (See Invalid input for Operation)

[G'Ｕｎａｂｌｅ ｔｏ ａdd network [أبتث_Network].ฏูİı｜]

POST 'https://<ip>/openstack/network/v2.0//subnets'

Source:
{"subnet":{"network_id":"274f5e1f-9326-4b57-a1fc-3e835e507cb9","cidr":"15.15.15.0/24","enable_dhcp":false,"ip_version":"4","gateway_ip":"15.15.15.0","dns_nameservers":[],"allocation_pools":[{"start":"15.15.15.1","end":"15.15.15.254"}]}}

Response:
{"NeutronError": {"message": "Invalid input for operation: [G'\uff27\uff41\uff54\uff45\uff57\uff41\uff59 \uff49\uff53 not valid on subnet\u0e0f\u0e39\u0130\u0131\uff5c].", "type": "InvalidInput", "detail": ""}}