What is the significance of the triple blessing - "Va'ahevcha, u'Veirach'cha ve'Hirbecha"?
Ramban: It refers to the Dayanim who perform Mishpat, inasmuch as Hashem will cause the families whom they have found guilty to love them, no harm will befall them (the judges) following their harsh judgment ("u'Veirach'cha") and they will not decrease on account of the death of the sinners ("ve'Hirbecha") - even if this entails many people, such as in the case of an Ir ha'Nidachas.
What is the translation of "Sh'gar Alafecha"?
Rashi: 'The babies of your cattle' - which the cows have 'thrown out' of the womb. 1
See Sifsei Chachamim.
What are "Asht'ros Tzonecha"?
Rashi #2 (citing Targum Onkelos) and Targum Yonasan: 'The flocks of your sheep'.
Rashi (Ibid.): Like the Pasuk in Tehilim 22:13 "Abirei Bashan" - which literally means 'the mighty ones of Bashan', but which refers to the high-quality sheep for which Bashan was famous.