Difficult to find how to translate the content of a Select2 widget

• Drag-drop a String field in a layout. For example, dc:nature
• Use the "Single Directory Suggestion" widget
• Select a vocabulary which exist with translation. here: "nature"
  => No easy way to have the correct labels at runtime in the browser

To get the labels, you need to check "Translated" in the Widget property Editor.
I find it confusing because the help for this fied states "If translated, the label (and help label) will be considered as a message property to translate."
=> I thought it will apply only to the label, so I did not checked it

So, basically:
-> Vocabulary and Chained vocabulary have a "Localized" checkbox
=> No suggestion widget (aka Select2) have this box, and it's difficult to figure out that "translated" must be checked

=> Reorganize the properties and/or make it clear what it does