[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
Also, can you add a comment for the reason for this monkey patch.  What are the issues it solves?  If there are upstream documentation points like a blog or something, please add the URL to that, or even better if there is an upstream issue or PR, please put the URL to that as well.  This way once it's corrected in upstream we have a chance to know if we can remove the patch.