Angular internal service to recognize MessageFormat extensions in interpolation expressions. For more information, see: https://docs.google.com/a/google.com/document/d/1pbtW2yvtmFBikfRrJd8VAsabiFkKezmYZ_PbgdjQOVU/edit
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https://code.angularjs.org/1.4.14/docs/api/ngMessageFormat/service/$$messageFormat