Also you can check my previous posts on:
By default in each list, Add new item comes like this:
Follow below steps:
- Edit the page first and then insert a content editor webpart
(From the ribbon click in Inset then select web part. Then from the list of web part categories, select Media and Content category and then Select Content editor web part).
- Then select the content editor web part and then go to Edit HTML Source as shown in the fig below:
document.getElementById("idHomePageNewItem").innerHTML="Add New Leave Form"
- Then Save the page and Refresh the page. Now the new text (Add New Leave Form) will come instead of Add new item.