Hello guidonietmann,
Thanks for reaching out to us!
Sharing the translation for WooTickets would be awesome! Here is the forum post that shows the process for submitting translations for our plugins.
The recurring event functionality is a feature of The Events Calendar Pro. You’ll need to purchase the pro version to get the recurring events functionality.
As far as the events not displaying on the calendar with W3 active, have you tried purging or deleting the cache from within your WordPress dashboard to see if that allows the events to display? If so, there should be a setting within the plugin that allows that cache to be purged whenever a new post ( or event ) is created or updated.
Let me know if this helps.
Thanks!