First off the charset is based on your language choice so you cannot really change that.
Secondly your database has been created with <i>iso-8859-1</i> as the charset, this means that its not possible to use it for the language(s) you have chosen. You will have to change the charset of your database to either iso-8859-2 or UTF-8 for Unicode support.
That's not what happened beacuse my database is in iso-8859-2, and EZ wanted iso-8859-1. But in the setup I don't get the chance to choose my language (Croatian) so how can I tell eZ to use iso-8859-2 during the setup?
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Nothing is impossible. Not if you can imagine it!