Load hyphenation patterns for Bulgarian and Church Slavonic

Patterns for Bulgarian (bg) and Church Slavonic (cu) are now loaded
too.

Also make changes to fontchain_lint.py, so it knows the script for Bulgarian
and Church Slavonic is Cyrillic.

Test: make -j works and creates .hyb files for bg and cu
Change-Id: I0586f6c49380279ef88fe952b5cfd2d3594c5524
diff --git a/tools/fonts/fontchain_lint.py b/tools/fonts/fontchain_lint.py
index f193ea4..eb8a1cc 100755
--- a/tools/fonts/fontchain_lint.py
+++ b/tools/fonts/fontchain_lint.py
@@ -14,7 +14,9 @@
 
 LANG_TO_SCRIPT = {
     'as': 'Beng',
+    'bg': 'Cyrl',
     'bn': 'Beng',
+    'cu': 'Cyrl',
     'cy': 'Latn',
     'da': 'Latn',
     'de': 'Latn',