Bug in FMUGeneration.jl

[ufechner7]

Two issues:

• the example in the documentation does not work, see: https://discourse.julialang.org/t/dyad-builder-fmus/132792/9https://discourse.julialang.org/t/dyad-builder-fmus/132792/9
• exported names for variables must not contain unicode letters

I used FMUGeneration v3.4.1 and Julia 1.11.7 on Linux.