Rename "Stop Generating Recipes" button

[rjwignar]

During our post-sprint demo meeting today, we discussed the possibility of renaming the "Stop Generating Recipes"button.

One possible name is something like "Generate with new diet". It doesn't have to be that exact name.

[kpunno]

i think if we just change the button type to primary and say "change diet" or even just "back", it will get the point across better.

[rjwignar]

Fixed by #114