You may choose to prevent ... string is called
YouMayOptOut2, so you can take a look at the translation strings in
plugins/CoreAdminHome/lang/XX.json for it.
As you can see, even though parts of Matomo are translated in Croatian, these strings are not.
The best way to contribute is to join the translation team at
Then in the next minor Matomo release (which probably now will be Matomo 4), it will be included.