How can I translate all taxonomy terms at once?

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You can translate all taxonomy terms at once by assigning them to a temporary post or page and sending it to translation.

To translate all your taxonomy terms at once:

Create a temporary page or post.
Assign all taxonomy terms you want to translate to this post and save as draft.

Assigning all taxonomy terms to a temporary post

Next, go to WPML → Translation Management and send the post for translation.

WPML will now translate all taxonomy terms assigned to the post. If you’re translating manually, the taxonomy terms will appear as fields in the Advanced Translation Editor.

Translating taxonomy terms in the Advanced Translation Editor