I was very hesitant to put Esperanto in my resume myself because of all the misconceptions people have about it (which are neatly listed here: What are the most common misconceptions about Esperanto?What are the most common misconceptions about Esperanto?). I decided to do so in the end, after a non-esperanto-speaker told me I should absolutely write it. She said it is a great example of determination and deligence, just like learning any other language.