Improve the display of the Office Importer in French

Steps to reproduce:

1. Set up your Office Server and connect XWiki to it
2. Go to "Administration: Localization" and set FR as the only available language
3. Go to http://localhost:8080/xwiki/bin/view/XWiki/OfficeImporter
4. Check the Destination section

Doesn't reproduce for English or other languages. I think the display looks like this because the informative text exceeds 2 lines.