Update index.html

Add three-letter code for Bosnia and Herzegovina according to
ISO 3166-1 (see http://en.wikipedia.org/wiki/ISO_3166-1 and
http://en.wikipedia.org/wiki/List_of_international_vehicle_registration_codes)
and Latin spelling of local name in addition to Cyrillic.
Merge pull request #51 from ebukva/patch-1

Alternative spellings for Bosnia and Herzegovina