In this case I don't think you really need a translator because you are connecting low volt outputs to hi voltage inputs. ie Connecting 3.5 volt logic outputs to 5 volt inputs should work as long as the LCD Vih is well below 3.5 volts. Check the data sheet for your LCD, Vih is probably around 2.5 volts which should work just fine. But keep in mind that you can not connect 5 volt logic outputs to 3.5 volt logic inputs or you will probably brake something.
I don't know about the library question.
Dave
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