MQTT On/Off to Open/Closed

I thought I had seen a way to map an MQTT On/Off to Open/Closed but I can’t find it. Is it possible or do I need to use a rule?

Yes, you can do it.

Go to your contact item by using the main ui

under metadata → state description → options

There you paste for example:

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Has this actually to be done for every item or can this also be done globally for e.
g. a contact with OPEN/CLOSE. This would make it easier to get it language specific.

Yes, you would have to configure this for every item. Alternatively, you could configure a rule that captured these events (using a group to capture the item) and convert the state as needed.