Extract translatable strings from Twig template strings.
It was made to be used with gmarty/gettext and it's mostly copied from smhg/gettext-swig
warning: For the time being, it only extracts string in the form {% trans "string here" %}
which
is the most basic case described in Twig's The i18n Extension
./bin/xgettext-template ./views/twig/menu.twig -k trans