[Toaster] [review-request] bbarrosp/import-layer-text

[Barros Pena, Belen]

Just realised that the text we show next to the import layer button is
completely out of sync with form. This patch fixes that:

564fc23895b6c21d583953649ef26879eca901bb
bitbake: toastergui: change the import layer action help text


Thanks

Belén