I don't think it is possible to delete the master language branch. But maybe this tool might help you (never tried it myself, just found it googling) http://blog.najmanowicz.com/2009/04/06/advanced-language-manipulation-tool-for-episerver/
Updated version of the tool Magnus mentioned is here: https://www.coderesort.com/p/epicode/wiki/LanguageTools. I've used it in the past with great success :).
10x alot i will use it
we are trying to delete a page language that the page was created in.
the page was created in english , we added 2 more languages for the same page
when trying to delete the orignal language (english) it his not shown in the drop down ??