Translate foreword up to introduction email
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Translate paragraph about adjacent systems in foreword

I translated 'adjacent' in this context as 'à l'interface de',
using as reference the presentation of 'Adjacent Systems' in
the context of the analysis of requirements [1].

[1] Adjacent Systems
http://my.safaribooksonline.com/book/software-engineering-and-development/software-requirements/0321419499/project-blastoff/ch03lev2sec20