I try to install the sandbox but I get the following error from composer:
Loading composer repositories with package information Installing dependencies from lock file Your requirements could not be resolved to an installable set of packages.
Problem 1
- Installation request for sonata-project/intl-bundle 2.1.0 -> satisfiable by sonata-project/intl-bundle 2.1.0.` - sonata-project/intl-bundle 2.1.0 requires ext-intl * -> the requested PHP extension intl is missing from your system.` Problem 2
- sonata-project/intl-bundle 2.1.0 requires ext-intl * -> the requested PHP extension intl is missing from your system.` - sonata-project/news-bundle 2.1.x-dev requires sonata-project/intl-bundle 2.1.* -> satisfiable by sonata-project/intl-bundle 2.1.0. - Installation request for sonata-project/news-bundle 2.1.