[3.0] Fix for multi-language support.

[3.0] Fix for multi-language support.

* Pass the preferred font's description to the
  MultiLanguageSupport::ValidateFonts() method instead of
  a vector of font runs with default font's identifiers.

Change-Id: I88ded17f10be3f78fd7dfbca404f78eaf779aaa9
Signed-off-by: Victor Cebollada <v.cebollada@samsung.com>