It is permissible to forgo the remaining time of the marriage period even without directly addressing the wife; the husband can say in any language that his wife so-and-so is released for the rest of the marriage duration.
This phrase refers to seeking intercession of Imam Ali (peace be upon him) to Almighty Allah. Intercession is one of the Islamic concepts founded upon verses of the Holy Book and narrations of the Prophet and the Imams (peace be upon them all).
If one is aware that there are differences between the Maraje in the rulings that affect him, which is usually the case, then he must observe precaution. Since its not practical for many to do so, he must find the most knowledgeable from them and follow him.