Improving my example on how to use the metadata obtained to create validation rules in knockout (http://stackoverflow.com/questions/13662446/knockout-validation-using-breeze
This is a good idea. Please add it to the Breeze User Voice ( and vote for it). We take these suggestions very seriously.
There is another approach for the short term. You can replace any of the
Validator.messageTemplates
with your own messages. Validator.messageTemplates is a configuration object keyed by the name of the validator where the value is a parameterized version of the error message.
We do need to document this better.