Minor orthographic typo

The number *sixteen* in spanish should be written with an acute accent, e.g. *dieciséis*
Add coverage for number sixteen in spanish
Add special orthographic case for twenties in spanish
Add handling of special orthographic case for twenties in spanish
Add coverage of special orthographic case for twenties in spanish
Minor typo
Add special case for one thousand in spanish
Modify coverage for one thousand in spanish
Merge pull request #85 from jlduran/patch-1

Minor orthographic typo