How to change IVA name

Hi Everybody I am from Dominican Republic we use the term ITBIS for taxes.
Currently I am using the spanish version and I would like to change the IVA label to ITBIS.
I read that if I edit in es_ES lang I could solve, but I did it and no change has ocurred.
Can you help?

Thanks…

Which version of Dolibarr do you use ? Di you try to setup your language to es_DO ?
If yes, which file and line did you edit ? and on which screen did you see the label “IVA” ?

We hace the same situation

which dolibarr version do you run @ErmekaDominicana ?