mgagit: Send a second email about any i18n changes to the i18n-reports ML.
After sending the original email, we send a second email to i18n-reports
detailing any i18n changes.
The method of determining if any changes affect i18n is to look for a
folder (or folders) called '.tx' in the tree. If such folders exist,
then any changes in their parent folders are considered to be relevent