Improve non-english languages support

 Add tex_babel and tex_fontenc instructions
 to metas to control TeX's babel and fontenc
 packages.

Signed-off-by: Arthur Koziel <arthur@arthurkoziel.com>

yml2tex/__init__.py

@@ -149,6 +149,10 @@ def header(metas):
 
     out = "\documentclass[slidestop,red]{beamer}"
     out += "\n\usepackage[utf8]{inputenc}"
+    if metas.get('tex_babel'):
+        out += "\n\usepackage[%s]{babel}" % metas['tex_babel']
+    if metas.get('tex_fontenc'):
+        out += "\n\usepackage[%s]{fontenc}" % metas['tex_fontenc']
     out += "\n\usepackage{fancyvrb,color}\n\n"
 
     # generate style definitions for pygments syntax highlighting