I've read through many posts relating to encoding issues, but non of them helped or was applicable to my case. I am doing Swirl exercises which involve German characters including ä, ü, ö and ß. However, these are displayed both in R and in RStudio as, for example <U+00DF>, (ß). This becomes problematic when these characters feature in Swirl's multiple choice questions, because, if the correct answer contains such characters, the problematic characters are submitted as an answer and not accepted by the Swirl lesson. In this case, it is also not possible to skip the question.
I've tried to run 'defaults write org.R-project.R force.LANG de_DE.UTF-8' in the Terminal, but this didn't solve the issue. I am using a mac running macOS Mojave and the latest verisions of both R and R Studio, UTF-8 is set as default encoding system, the computer was bought in Belgium.