If you are selling to consumers the localization of terms should be considered. You will need to ensure you localize legal terms as well as translate them Into the local language.
The failure to do so will allow complaints to be filed and considered under terms which you have not dictated, and even worse, under terms which have not limited your liability.
B2B contracts do not necessarily need to be legally localized, although they may need to be if negotiating with larger overseas customers that insist their local laws govern the contract.
Europe has strict data protection laws that require businesses which receive or process personal data to follow strict rules regarding its use, receipt and retention.
Specific consent or disclosure must be made to the data owners and may not be transferred outside of the EU without the appropriate registrations to ensure protection and proper use.