let TT auto-detect templates encoding

lib/IdPAccountManager/WebRequest.pm

@@ -170,12 +170,9 @@ sub respond {
     $self->{logger}->log(level => LOG_DEBUG, message => "");
 
     ## Parse template
-    my $tt2 = Template->new(
-        {
-            ENCODING => 'iso-8859-1',    ## le défaut apparemment
-            INCLUDE_PATH => $self->{configuration}->{templates_dir}
-        }
-    );
+    my $tt2 = Template->new({
+        INCLUDE_PATH => $self->{configuration}->{templates_dir}
+    });
 
     my $template;