docs/content/error/$interpolate/unsafe.ngdoc
@ngdoc error
@name $interpolate:unsafe
@fullName MessageFormat extensions not allowed in secure context
@description
You have attempted to use a MessageFormat extension in your interpolation expression that is marked as a secure context. For security purposes, this is not supported.
Read more about secure contexts at {@link ng.$sce Strict Contextual Escaping
(SCE)} and about the MessageFormat extensions at {@link
guide/i18n#MessageFormat AngularJS i18n MessageFormat}.