Raptus.header

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* fixed isTemporary attribute on non-archetype object
* add french translation

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* Be more defensive about the existence of raptus.article.core (an AttributeError was raised
if the package was available but not installed)
* CSS Bugfixes for the information box
* Adjusted thumbing (a value of 0 in the properties now means no thumbing)

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* Improved wording of the disable/enable feature

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* Added disable/enable functionality

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* Fixed None value on Image

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* Fixed long description of package