Initial import when adding a new project

[swissspidy]

It would be very convenient to import translations for a newly added project without having to manually run wp traduttore update or waiting for the next commit.

Perhaps by adding a single cron event when saving a project or by adding a button to the UI.

[swissspidy]

This would only apply to a few projects when the source URL template is filled out correctly and the repository is publicly accessible.