I have a different problem. On profiles where the person's language was something other than English, the old succession box allowed us to put in lines like:
| preceded-text = Prédécesseur
and
| succeeded-text = Successeur
so that the succession box would display correctly in that person's language. (For examples, see Charles de Gaulle and Ulric-Joseph Tessier.)
I tried adding:
| preceded-text1 = Prédécesseur
and
| succeeded-text1 = Successeur
but that didn't change the headers, so then I tried adding:
| preceded-text = Prédécesseur
and
| succeeded-text = Successeur
and that didn't work, either.
Is it possible to tweak the new Succession template, either to allow for option preceded-text and succeeded-text entries, or maybe to allow a language parameter?