Bugfixhack: Handles in the XML output.
Bugfixhack: Handles in the XML output.

Getting correct handles requires the language class. It turns out that on ETM preview pages, the language is available but not 'activated' (i.e. transliterations are not available). This means that:

1. Handles may be wrong.
2. The preview may break on `RecipientgroupManager::create($rgroup_handle)` if the handle is wrong.

The applied solution is a quick fix. We haven't really found what is causing this issue.
jonmifsud/email_newsletter_manager,creativedutchmen/email_newsletter_manager,jonmifsud/email_newsletter_manager,creativedutchmen/email_newsletter_manager