Module names containing a cedilla fail to register

[rprimet]

While trying to interpret a file calling a module Français, I got this error:

(catdev) romain@enclume:~/inria/cat_root/catala-language-server$ clerk run test-case-parser/examples/test_case_french.catala_fr -s French_test
[1/2] <catala> interpret French_test ⇐ _build/test-case-parser/examples/test_case_french.catala_fr
┌─[ERROR]─
│
│  Module Français was loaded from file "test-case-parser/examples/Français.cmxs" but did not register properly, there is something wrong in its code.
│
└─