generic and custom per-field validation

web/public/locales/en/validation.json

@@ -0,0 +1,20 @@
+{
+  "minimum": "Must be at least {{limit}}",
+  "maximum": "Must be at most {{limit}}",
+  "exclusiveMinimum": "Must be greater than {{limit}}",
+  "exclusiveMaximum": "Must be less than {{limit}}",
+  "minLength": "Must be at least {{limit}} character(s)",
+  "maxLength": "Must be at most {{limit}} character(s)",
+  "minItems": "Must have at least {{limit}} items",
+  "maxItems": "Must have at most {{limit}} items",
+  "pattern": "Invalid format",
+  "required": "This field is required",
+  "type": "Invalid value type",
+  "enum": "Must be one of the allowed values",
+  "const": "Value does not match expected constant",
+  "uniqueItems": "All items must be unique",
+  "format": "Invalid format",
+  "additionalProperties": "Unknown property is not allowed",
+  "oneOf": "Must match exactly one of the allowed schemas",
+  "anyOf": "Must match at least one of the allowed schemas"
+}