Language option for authors and keywords?

Both author and keyword pages get the main language of site. There is
no any option to choose language for them. If the main site language
is RTL, then author and keyword pages are RTL too.
There should be language options for the authors and keywords, and
possible separation in the template like article.en.html,
article.fa.html, rubrique.en.html and rubrique.fa.html.
Is there any solution for now to separate authors and keywords based
on a language?
Hope SPIP developers add this function in the next version.