Collective.iconifiedcategory

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- When no request (when using `plone.app.async`), pass `None` instead `{}`
to `ImageDataModifiedImageScaling` so `plone.namedfile` scaling is happy
when using `plone.protect >= 3`.
[aduchene]

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- Adapted french translation for `More infos`.
[gbastien]

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- Fixed `utils.get_ordered_categories` and
`IconifiedCategoryGroupAdapter.get_every_categories` to make sure returned
categories are from the correct `config_root` and `cachekey` is invalidated
if `config_root` changed.
[gbastien]

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- Added `categorized-childs-manage` that will render a link to manage
categorized elements.
[gbastien]
- Implemented `CategorizedContent._unrestrictedGetObject` as `collective.eeafaceted.z3ctable`
calls now `item._unrestrictedGetObject` instead `item.getObject` for performance optimization.
[gbastien]
- Added `safe_utils.py` that will only include safe utils.
[gbastien]
- We need to escape some content to avoid malicious content:

- Rely on collective.eeafaceted.z3ctable to display the categorized content table, it manages escaping content;
- Escape category title in vocabularies.

[gbastien]

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- Make `validateFileIsPDF` invariant check if a `contentType` is directly
available on data, this avoid checking on the file.
[gbastien]

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- Fixed `metadata.xml` version, set `2103` instead `2101`.
[gbastien]