[WIP] Automatic gettext calls on static texts in HAML

The **haml-magic-translations** gem automatically calls `_()` on all static texts in HAML files.
For string extraction see: https://github.com/potager/haml-magic-translations#extracting-strings-and-merging-translations
Typical we put the patches into `/lib/util/extensions` to keep them in one place, but this is haml, so it's only on the vmdb side.  It could go into /vmdb/lib/extensions/haml_extensions.rb or something.  @jrafanie @tenderlove Thoughts here?