Collective.iconifiedcategory

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- Adapted translations so it is more understandable.
[gbastien]
- Do only call `_cookCssResources` in `category_before_remove` if not currently
removing the `Plone Site`.
[gbastien]
- Make `ICategory.icon` a primary field so we may use a simpler download URL
that is only the `path_to_object/download` without the file name anymore.
This is done to surround a bug in Apache that occurs when the filename
contains the `%` character.
[gbastien]

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- Generate a CSS class on the `<ul>` tag of the `categorized-childs-infos` view
that is the AJAX view called when hovering the `categorized-childs` elements
that will give the ability to display the infos on several columns. This is
necessary when displaying a large amount of categorized elements using same
content_category. The `Maximum number of elements to display by columns
when displaying categorized elements of same category in the tooltipster widget`
can be defined in the iconifiedcategory control panel.
[gbastien]
- Moved registry parameter `filesizelimit` to the IIconifiedCategorySettings.
[gbastien]
- Added a way to defer call to `utils.update_all_categorized_elements` in the
`categorized_content_container_cloned` IObjectClonedEvent event handler.
[gbastien]

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- Makes `collective-iconifiedcategory.css` cacheable and cookable to avoid
recomputing it for every pages. We call `portal_css.cookResources` when
a category is added or moved. Not necessary to recook for subcategory
as it uses same CSS class as parent category.
[gbastien]

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- Do not fail in `utils.get_categorized_elements` if context does not have the
`categorized_elements` OrderedDict.
[gbastien]

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- Use a batchSize of 999 in the tabview to show every categorized elements.
[gbastien]
- In `utils.get_categorized_elements`, do not do the catalog query if the
categorized_elements dict is empty.
[gbastien]

-----------------

- Only check `can_view` if current element is `confidential`, moreover only
instanciate the `IIconifiedContent` adapter to check for `can_view` when
element is `confidential`.
[gbastien]