Geia sou file mou 
This is a know problem, try to use Inkscape to import text instead.
Encoding issues in a Text Layer
Making the Style and Weight parameters of the Text layer work
Bug report #973 - arabic text not supported in synfig
Geia sou file mou 
This is a know problem, try to use Inkscape to import text instead.
Encoding issues in a Text Layer
Making the Style and Weight parameters of the Text layer work
Bug report #973 - arabic text not supported in synfig