Windows XP does not support or use the BCD at all. The BCD is the boot manager for Windows Vista and Windows 7. So the error that occurs when you click to Backup/Repair is correct. It isnt a bug when that is the function of the BCD to only be used with those Operating Systems. Windows XP uses the boot.ini, not the BCD. BCD was introduced first with Vista. When you click Install BCD you are telling it that you have one of the qualifying OS's installed. So you have to add and entry for one of those qualifying entries in order to backup/repair. So number 2 isnt a bug, it is operating as it should.
#1 and #3 Guru will have to figure out. EasyBCD hasnt been translated into all languages. So it could be that with #1 the translation isnt correct.