docs: conf.py: add CJK package needed by translations

In order to be able to output Asian symbols with XeLaTeX, we
need the xeCJK package, and a default font for CJK symbols.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
diff --git a/Documentation/conf.py b/Documentation/conf.py
index 13b5f71..fa0a42b 100644
--- a/Documentation/conf.py
+++ b/Documentation/conf.py
@@ -277,6 +277,10 @@
         \\setromanfont{DejaVu Serif}
         \\setmonofont{DejaVu Sans Mono}
 
+	% This is needed for translations
+        \\usepackage{xeCJK}
+        \\setCJKmainfont{Noto Sans CJK SC}
+
      '''
 }