When you call the record's newForm() method, it will generate labels and descriptions for the form elements from the LABEL_* and DESCR_* keys from the *model* locale file. This is because it is the model record generating the form object.

When you add fieldsets, groups, etc. in the view, the locale strings come from the *controller* locale file. This is because you are no longer operating inside the model record; you are in a view being generated by the controller.

When a record has an invalid property, its invalidation message normally comes from the the filter locale file. If a validation filter ValidateAlpha on a property column_name fails, then the translation key will be INVALID_VALIDATE_ALPHA. You can override these validation-specific messages in your vendor-specific filter locale file.

Alternatively, you can provide an override translation key for invalid model properties based on the property name. In the model locale file, if you have INVALID_COL_NAME, that translation key will be used any time the property is invalid, no matter which validation filter fails for that property.