add ja tracking translation
add ja tracking translation

pcottle/learnGitBranching,andriymoroz/learnGitBranching,edombowsky/learnGitBranching,Maximaximum/learnGitBranching,edombowsky/learnGitBranching,pcottle/learnGitBranching,andriymoroz/learnGitBranching,pcottle/learnGitBranching,Maximaximum/learnGitBranching