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