Browsing Brazilian Portuguese translation

Translators: This phrase is spoken to inform the user that what is about to
be spoken is an nth root. https://en.wikipedia.org/wiki/Nth_root. For instance,
for the fourth root of 9, Orca would say "fourth root of 9, root end" (assuming
the user settings indicate that root endings should be spoken). Note that the
index, which precedes this string, is unknown and might not even be a simple
expression like "fourth"; the index might instead be a fraction.