Apostrophe not accepted.

I think that when downloading ttf files you have to check the writen example underneath on the web page to make sure that things like aopostrophe's can be writen with your chosen text. 

you can use programs like fontforge to edit and/or create fonts. Maybe you can add the ' there. I have no clue about how the program works, though.

Thank you all.

Finally, I choose another font