lang spanish words cleanup.

removed words that were not matching their image
and words with no image.

Added missing accents on words in content.txt.
lang spanish words cleanup.

removed words that were not matching their image
and words with no image.
lang words, removed dark image and voice.

The image was confusing, does not explicitly
mean 'dark' as it should.
minor, removed uneeded word.
Merge remote-tracking branch 'upstream/voices'