If you want to change the language that the tool tip is displayed in, I think setting up languages this way will change the language of the tool tip
Then if you want to change the default "wording" the text for the tool tip - description....
Not sure if IQSS Dataverse folks want sites to do this, but here's how you can change the tooltips:
Edit this file: citation.properties (or your language citation.properties file)
The tool tips are descriptions like this: datasetfieldtype.title.description=Full title by which the Dataset is known.
Once you edit the citation.properties file, you need to stop and re-start payara.
University of Virginia Dataverse