The answer to this question varies depending on the jurisdiction, in most places, the losing party pays all legal fees necessary to the winning party's case. This principle is called "costs follow the event"
Most of the time, there are exceptions to this rule where: the winning party unnecessarily incurred costs, where the winning party rejected an offer to settle for an amount greater than the amount he won at trial, and many other factors.
You will have to check how costs are determined in Austrian civil law, to see if the above general principles apply, or if Austrian law does things differently. A good starting point would be the Austrian version of their civil procedure rules.