sort vocab alphabetically if the frequency is the same, solving issue #199
sort vocab alphabetically if the frequency is the same, solving issue #199

emjotde/Marian,marian-nmt/marian-train,emjotde/amunn,emjotde/amunmt,marian-nmt/marian-train,marian-nmt/marian-train,marian-nmt/marian-train,emjotde/amunmt,emjotde/amunn,emjotde/amunn,amunmt/marian,emjotde/amunn,amunmt/marian,amunmt/marian,emjotde/amunmt,marian-nmt/marian-train,emjotde/amunmt,emjotde/Marian