typo
typo

s/opcionally/optionally/  (also needed in `nikola/conf.py.in` and `tests/data/translated_titles/conf.py`, let's see if the github trivial-edit interface is enough to change them all...
xuhdev/nikola,Proteus-tech/nikola,okin/nikola,JohnTroony/nikola,getnikola/nikola,yamila-moreno/nikola,yamila-moreno/nikola,atiro/nikola,s2hc-johan/nikola,pluser/nikola,Proteus-tech/nikola,jjconti/nikola,jjconti/nikola,jjconti/nikola,knowsuchagency/nikola,berezovskyi/nikola,TyberiusPrime/nikola,x1101/nikola,getnikola/nikola,JohnTroony/nikola,Proteus-tech/nikola,techdragon/nikola,wcmckee/nikola,immanetize/nikola,getnikola/nikola,berezovskyi/nikola,gwax/nikola,lucacerone/nikola,xuhdev/nikola,berezovskyi/nikola,andredias/nikola,techdragon/nikola,wcmckee/nikola,pluser/nikola,TyberiusPrime/nikola,knowsuchagency/nikola,wcmckee/nikola,andredias/nikola,x1101/nikola,xuhdev/nikola,immanetize/nikola,okin/nikola,lucacerone/nikola,x1101/nikola,okin/nikola,masayuko/nikola,JohnTroony/nikola,techdragon/nikola,okin/nikola,schettino72/nikola,knowsuchagency/nikola,schettino72/nikola,s2hc-johan/nikola,immanetize/nikola,atiro/nikola,gwax/nikola,schettino72/nikola,yamila-moreno/nikola,masayuko/nikola,masayuko/nikola,andredias/nikola,lucacerone/nikola,Proteus-tech/nikola,atiro/nikola,TyberiusPrime/nikola,xuhdev/nikola,s2hc-johan/nikola,gwax/nikola,getnikola/nikola,pluser/nikola