Modified unit tests && operating system class. Reviewed by JN, thanks !!

Violette Roche-Montane

13.06.2014 2ed9940ca86ca86abf5fae8a5bdc461b32d1a13a

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user-friendly-name=Arrel d'extensions
relation.plugin.user-friendly-name=Extensi\u00f3
relation.plugin.user-friendly-plural-name=Extensions