Lithuanian and Latvian language packs for version 2

Jaunius Belickas provided Lithuanian translation for miniBB, which as usual is available in Downloads. It's a fact - for 4 years of miniBB existing, we have no Lithuanian translation even for old 1.x series... at the times Lithuania is our closest neighbour! Labai dekui, Jaunius! :-)

Our constant colleagues at Virtualis Solutions also provided updated and fixed version of Latvian language for 2.0 series. Paldies!