Flash Decompiler Trillix for Windows doesn't feature global fonts replacement is SWF file.
However, you can change font for each static text separately, while editing this text in "Edit texts" bar.
Flash Decompiler Trillix for Windows uses fonts installed in your system. If the font that you would like to use is installed in your system and this font is supported with Flash Decompiler Trillix for Windows, you can select this font for your static text instead of the one used in original SWF file.
In this case, this new font will be added to your SWF file.
For more information on editing static texts with Flash Decompiler Trillix for Windows, please, watch the following tutorial at Eltima YouTube Channel: http://www.youtube.com/EltimaSoftware#p/u/8/542BtNWRuek
Please, also check the following FAQ article on the fonts supported with Flash Decompiler: http://wiki.eltima.com/no-font.html