because the french "in" is hard to pronounce for most anglophones. it doesnt really exist in the english language.
So you say something close to Moulang Rouge? (light on the m it almost sounds like theres a g?)
you know there are so many different accents within french I couldnt tell you which is right. As for me, I pronounce it more like Moul-eh (n) Rouge. The (n) is not completely silent but not complete there either hehe.
The eh by the way sounds like the ai in the word AIR... oh god this is never ending, too many ways to pronounce things