fixed p a r e n t h e t i c a l bug

Fixes a bug that caused the class of parenthetical elements in the dialogue to be rendered as <p class="p a r e n t h e t i c a l">.

The value of the class variable is supposed to be iterable, e.g. a list. Making it a string, caused the following functions to join every character of the string seperated by a blank.

Fixed by turning the value of the class variable into a list with one element.