I feel kind of bad for Melania. I guarantee you she did not write that speech, it was handed to her and she had to (probably reluctantly) deliver it with all the enthusiasm she could muster. Now she's getting nothing but ridicule for it. She may be the first in line to vote for Hillary so she doesn't have to bear 4 years of that.
I was wondering the same thing about whether or not they copied it on purpose. I mean, either the staffer that wrote the speech is so dumb he figured nobody would notice, or he did it on purpose to generate buzz. Like
@Beyer160 said, in the long run it really won't matter, but for the next week all we'll hear about is Melania's speech instead of the sideshow that is the convention.