The aaltologo package has been updated to version 1.1.2, you can download it from the aaltologo page (direct link to the package). This update relaxes the need of the babel package. If the babel package is not included, the logo text lines will be in English. However, if the logo text lines are wanted to be in Finnish and/or Swedish, use the babel package with appropriate language option.
Jussi Pekonen, the maintainer of the aaltologo package, Department of Signal Processing and Acoustics