fix form fields import

lib/templates/find_acro_fields.rb

@@ -225,7 +225,10 @@ module Templates
         is_option_number = option.is_a?(Symbol) && option.to_s.match?(/\A\d+\z/)
 
         option = option[1] if option.is_a?(Array) && option.size == 2
-        option = option.encode('utf-8', invalid: :replace, undef: :replace, replace: '') if option.is_a?(String)
+
+        if option.is_a?(String) || option.is_a?(Symbol)
+          option = option.to_s.encode('utf-8', invalid: :replace, undef: :replace, replace: '')
+        end
 
         next if type == 'select' && option.to_s.match?(SELECT_PLACEHOLDER_REGEXP)