Error on buliding the project

I’ve just added my own native language and then tried to build the project with

mvn clean package

which was step 12 from the tutorial.

The console goes through a lot of tests but in English language there is an error in one of them and I am left with the generic exception:

Looks like there’s an encoding issue, see the messed up character after “variance, and”. Not sure what might cause this. I assume this is on Windows?

If it’s on Windows you can try to force UTF-8, e.g.
(use appropriate command to set env var for your shell)
before running the build command

If you are using notepad, change to notepad++ or any other editor that can properly edit utf8