How to import data into form fields with French characters?

We fill out PDF forms by going to Edit > Form Options > Import data and selecting a txt file that fills in the form fields. However, some of our clients are French and the special characters that contain accents are not importing properly. For instance, an 'â' turned into a ':'.

The text file was created used the Unicode UTF-8 encoding language and the characters work in the csv and txt files. We've tried the other options but none have imported the special characters properly.