Boxes (info, success, warning, error): default content (placeholder) not translated

Hi.

At /CKEditor/Translations there seem to be all translations currently used by the CKEditor. But this isn’t working for the macros info, success, warning and error box.

Translations are set:

ckeditor.plugin.slash.action.info.defaultContent=Hier die Informationsnachricht eingeben.
ckeditor.plugin.slash.action.success.defaultContent=Hier die Erfolgsnachricht eingeben.
ckeditor.plugin.slash.action.warning.defaultContent=Hier die Warnnachricht eingeben.
ckeditor.plugin.slash.action.error.defaultContent=Hier die Fehlernachricht eingeben.

Any ideas?
Regards, Simpel

XWiki 15.10.11

It’s getting even funnier.

When I create the info box with clicking the + symbol in the inline editors toolbar and chosing info box the placeholder (or default content) is in english.

When I create the same info box with a quick action (/) and chosing info box the placeholder is in german.

But even this german translation can’t be customised at /CKEditor/Translations.