Game : Dialog Box Text & Read Line Per Line

Hello I'm actually programming a game in c++ and SFML and I would like to know how to wright the text of dialog Box in my code (I'm french so I write original dialog in french and I need to change them easely .

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I also need to know how to read line per line in a file open with iostream. In fact I have to say to my code "go pick that info at X line"

Thanks you in advance for your answer and sorry for my bad english
Have a look here. Someone had the same problem.
http://www.cplusplus.com/forum/general/233424/
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