Suggestion for Spanish easy_words.txt

[vcfuentes]

I have found a couple of issues regarding the easy_words.txt for the Spanish language:

• It contains single letters (e.g. m, c, b ...) that are not recognized as words in Spanish.
• It contains acronyms, whereas the easy_words.txt list for English does not.
• It contains words that could be considered difficult.

I think this could be solved by standardizing the way words are added to this list by some criteria, so everybody knows which type of words this list is going to contain.

[alxwrd]

The word list for Spanish was added in #120, but no source was provided for the list.

The list for English was taken from Dale, E. and Chall, J.S. (1995) Readability Revisited: The New Dale-Chall Readability Formula where easy words are words that 80% of fifth-grade students should find familiar.

[alxwrd]

To resolve this issue I think removing the single letter words and the acronyms is fair game. Without a source for the original word list, I don't feel it's ok to remove anything else at this time.