Support i18n for Pippo internal messages
Respect Response LANG local, if present, when determining language
Support rendering errors and exceptions through the template engine
Implement Freemarker templates for errors & exceptions
Implement Groovy templates for errors & exceptions
Implement Jade templates for errors & exceptions
Implement Pebble templates for errors & exceptions
Implement Trimou templates for errors & exceptions
Merge pull request #30 from decebals/template_errors

Support rendering localized errors & exceptions with the template engine