svenfuchs/rails-i18n — pull request #301 by psy-q (2013-02-14 09:56:15+00:00)
Title: New locale for Alemannic as spoken in Switzerland (Swiss-German)

We actually use this in our apps and it would be great to make it part of upstream. Alemannic is spoken in Switzerland, Germany and Austria, and Swiss-German is represented as Alemannic from Switzerland (gsw-CH).