data.js: add extra array attribute to each word
data.js: add extra array attribute to each word

Prepare to categorise words by introducing a new array attribute into
each word.  This will most likely serve as a container for 'tags' for
each word.

e.g.
     ["I try", "προσπαθώ", ["verb", "present tense"]],

aevri/prospatho,aevri/prospatho