fix(fragment): disabled description on fragment (#64)
* remove possibility to add a description when user put a fragment in a page Covers [UID-298](https://bonitasoft.atlassian.net/browse/UID-298)
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* remove possibility to add a description when user put a fragment in a page Covers [UID-298](https://bonitasoft.atlassian.net/browse/UID-298)
mentioned in commit 05af07ed