1). I'm not an ORM lover in general but, yes, if you're going to use an ORM and are basing your project on PHP, Doctrine is generally accepted as the best.

2). See: http://twig.sensiolabs.org/ (Why yet another template engine?)

3). Personal preference I guess but I hate gettext. I much prefer the pattern of using labels in your template (e.g. menu.item1) and then looking up that label in the desired language file e.g. messages.en.yml. And I've never had a problem with translators working with YAML files (i.e. the syntax is easy for them to grok)