[FIX] charts: Fix facet charts tpl following the smarty5 changes -...

• [FIX] charts: Fix typo from a90f097f

• [FIX] charts: Fix facet charts tpl following the smarty5 changes - preg_match and preg_match_all smarty "functions" do not return the $matches param by reference any more so use regex_replace to simplify the facet label and then split it.

• [FIX] charts: Make it possible to have more than one chartjs plugin per page again