Provides the error_message/1 macro for marking translatable error message strings.

At runtime, error_message("must be present") simply returns the string as-is. The macro serves as a marker so that mix ash.gettext.extract can scan source files and extract all error message strings into a .pot file for translation.

Usage

import Ash.Gettext

message: error_message("must equal %{value}")

This is automatically imported by use Ash.Resource.Validation.