I think you have an extra braille font installed. If that's the case, you can send it to other people to install (might be scary thing for them) or, you can simply convert the text objects to a path (Path>Object to Path), which renders the font to an svg path for you - I do this whenever I have bizarre fonts and I need to make the svg portable.  Please note that once you convert to path, you'll not be able to edit the text with the text tool.