texstudio commands \comment \alert and \add

Question

The new texstudio (4.0.1) added three new buttons to the top right of the tool bar. When pressing them, the insert a \alert{}, \comment{}{} and a \add{} into the texfile. However, compiling them results in an Undefined control sequence. \comment error.

What are these buttons supposed to do? And am I missing a package?

Edit: As suggested in the comments, I have added a code sample here:

\documentclass{article}
\usepackage{amsmath}
\pagestyle{empty}
\begin{document}
    some crazy text what so ever \\
    $ a = b + c $
    
    \comment{and after the formula}{gg zz uu}
    \alert{some text}

\end{document}

Answer 1

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage{easyReview} % for \comment, \alert, etc.
\usepackage{soulutf8} % for accented letters
\begin{document}
    \comment{and after the formula}{gg zz uu}
    \alert{some text őőőő}
\end{document}