Add translation key to popup when hovering over an Annotation

The wiki used to take the screenshots is in French, but some of the content is still in English language.

Seems that the "See thread" button on the annotation modal is hardcoded in /xwiki-platform/xwiki-platform-core/xwiki-platform-annotations/xwiki-platform-annotation-ui/src/main/resources/AnnotationCode/Macros.xml

We should add a key.

Image attached