Exporting file for translation doesn't include layer names

I don't work for Articulate, so I can't say for sure. However, my guess is that this is by design. Here's why I think that:

• Layer names are never seen in a published course. If they were exported for translation, that would add to the number of words to be translated. 
• When files are translated, the .story file isn't always handled by a foreign development team. I think it's much more likely that the original development team would handle the final files.
  • For example, I develop courses that are translated. I get the translated .story files back, but I do the final testing and publishing. (And I definitely don't want the layer names to be in a different language.)

You could submit a feature request asking to include the option to translate layer names. Frankly, though, I doubt that request would be implemented.