Is there a way to add all terms from a vocabulary to the translation cart at one time instead of one by one?

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Any feedback?

The way we have solved in custom code is the following:

• Create a custom action which add all the selected entities to the cart using the service tmgmt.cart. You may need to add the action per entity or alter it using hook_action_info_alter() afterwards to get it added to all translatable entities.
• Create a view that list all the terms in a vocabulary. It should include the bulk actions column and the new action enabled.

We implemented this solution for taxonomy terms, menu links etc. to make it much faster to translate these entities. Both our taxonomy term and menu link views are just flat lists and not showing the hierarchies.

Meanwhile, I found the Content Entity Source sub module.
Then on the TMGMT Sources tab, you can select taxonomy terms and check all terms...

Right. That is also a solution.