Create the 'About content' widget

There should be an aboutcontent widget that has 2 different tabs. The first tab is the Details tab and shows the metadata of the content (title, description, url, created by). When a description is not available, it should not be shown. The second tab is the Shared with tab and shows the list of members of the content.
Rather than doing the `{if}` inside of the translation key, I'd rather create 2 separate keys (one with link and one without) and have the if/else logic here.