Great tool Slarti. I have been using it since you released it
I´ll say something and I hope you don´t get it the wrong way:
Spanish uses accents, and they are as important as apostrophes are in English. Most apostrophes are not supposed to be used in formal or academic writing: contractions are not allowed here. However, English uses apostrophes not only to make contraction but to make possesives too. "Mi mom´s purse." "My dog´s tail." etc, and the most important use comes when you have to write "It´s" and "Its". They are not the same, are they? Well, accents make a difference not only in meaning but they also tell you how you pronounce the word. Bla, bla, bla, bla. You are missing some accents.
PS: I know this symbol " ´ " is not apostrophe, but since my keyboard is in Spanish, I do not know where is it :d