frasej unearthed an important issue. Characters like "<", ">", and "&" are going to cause problems. I am working on escaping the text so this is not a problem, but g_markup_escape_text is not working as I would expect it.

Edit: I forgot to mention - it is not a problem with GKeyFile as I first suspected, but with PangoMarkup, which I use to set the fonts for the menu.