That is a good point. Text display in general should be better online, as we aren’t using Python packages for text drawing. Instead, Pavlovia uses web technologies, which should be pretty good at handling most languages.
So you could actually test your existing experiment - even the standard text component should do well. I’ve just run a test in local debug mode, and this is what happens (specifying Arial, the top one is the standard text component, the bottom one is the new TextBox (just realised I left the bold, italic, and various background settings on for that)):
If you are thinking of running online, you should upgrade your version of PsychoPy to the latest version anyway: there has been some very active development in fixing issues since the version you are using: