The children macro isn't translated

Steps to Reproduce

1. Switch the language of the wiki to German (or French)
2. Search for "children" in the macro picker

Expected result

No macro is found, as the children macro isn't name "children".

Actual result

The "Children" macro is found, with English title and description.

The problem is that the translation keys of the Children macro weren't added to any language files when the macro was added in XWIKI-13588 and thus the macro cannot be translated on https://l10n.xwiki.org/.