On the homepage we have the “browse categories”.
When I use a megamenu, I insert a HTML block.
When I make different languages for that HTML block, the content does not get translated in the megamenu, but the categories get translated.
1. Create the translation of the HTML block http://prntscr.com/mqhred > Translate independently > update
2. Enter the menu in the translated language (you need to have all the items translated and synchronized) > enter the menu item > and add the HTML block as you usually do