"We are not boys, we are men."
Translation:Noi nu suntem băieți, noi suntem bărbați.
The first one is a T with cedilla, the second one is a T with comma. The letters with cedilla are used in many languages, most notably Turkish, while the comma is used in Romanian.
Windows replaced by mistake the letters with comma with those with cedilla on its earlier Romanian versions and thus the cedilla variants became widespread in Romania. It's been rectified in Windows 7.
I was certainly taught that two independent clauses needed a semi-colon between them, but I think the semi-colon is fading from modern usage. I seldom see it in this type of sentence in Duolingo whatever the language. And not often elsewhere either.
Be good to consult a recent style manual such as those used by major newspapers and magazines for what is currently acceptable.