Characters not displayed correctly/as boxes

[Chr1s70ph]

Characters are displayed as blank boxes. This would be fine, if it were just one box, for the search term "box", but the repetitiveness of those boxes showing up, leads me to believe that this is indeed not intended behavior.

[leokraft]

The reason for this behavior is, that the program currently searches all UNICODE charcters and creates for every matching character a button with the respective character inside. However for a character to be able to be displayed there has to exists a font that includes this character.
Currently I have no way of identifying wheter a character can be displayed (a font exists for it) or not (no font exists for it).
However this is indeed something that should be fixed.

Possible solution:

1. detect characters that can not be displayed and do not create a button for those
2. add a selection of fonts to the installer to increase number of displayable characters (increases size a lot)