The Chinese government has ramped up restrictions ahead of the birthday of a preeminent Tibetan Buddhist spiritual leader, calling on local leaders in two Tibetan regions to prevent people from posting his photo or well wishes online, sources with knowledge of the situation said Thursday. Authorities have threatened to arrest Tibetans in the Ngaba and Dzoge regions who defy the order by posting messages on Aug. 8, the 80 th birthday of the 11 th Kyabje Kirti Rinpoche (honorific) Lobsang Tenzin Jigme Yeshe Gyamtso Rinpoche. Rinpoche is the chief abbot in exile of the Kirti Monastery, one of the most…