Steps to reproduce:

1. Open -> Data collection -> Host -> Items
2. Click -> Create item
3. Select Type -> SSH agent
4. Change the Authentication type from "Password" to "Public Key"

Result:
The label of the "Password" field is not changing to "Key passphrase".
See video:

Expected:
When "Public key" authentication method is selected, the label of the "Password" field should be changed to "Key passphrase".