faq update

doc/faq.txt

@@ -194,6 +194,14 @@ in U8x8lib.h. This will increase speed a lot for I2C on all AVR uC. However the
 bus is always driven by this implementation. Other I2C devices will not work on
 the same pins.
 
+Q: Umlaut chars or other chars with a unicode value greater than 127 do not 
+appear on the displays. What is wrong?
+A; Check the following:
+Did you use drawUTF8() instead of drawStr()?
+Did you enable UTF8 when using print() with enableUTF8Print()?
+Does the font include the expected char? Fonts with a 'n' (numbers), 
+'u' (uppercase) or 'r' (restricted) at the end of the fontname do only 
+include glyphs with unicode lower than 128.
 
 Q: How can I generate my own font.
 A: The font must be available in bdf file format. Then use bdfconv to generate