svenfuchs/i18n-missing_translations — pull request #2 by Salzig (2012-02-27 14:04:53+00:00)
Title: Handling only MissingTranslation with 3.2.1 dosn't work. 

Had some problems getting i18n-missing_translations to work and figured out it had to do with the handling of Exceptions. MissingTranslation alone logs no missing translation with Rails 3.2.1, I18n 0.6.0. Match for MissingTranslation and MissingTranslationData solves the problem, at least for me and my mates.