Solution: Inside /system/framework there is a file called android.policy.jar use baksmali.jar and smali.jar to decompile file and the compile it back after you have edited the lockscreen.smali file.
And to your statement im cooking rom and don't know how to remove that text, go ahead and start cooking and know EVERYTHING from scratch. also make a non edited video for evidence that it is you and that you arent looking in tutorials and or asking for help.
And yes im sure i got the permission i got the emails from that dev as proof for it, and we speak on a daily basis aswell and i get hint's and tips.
But thank you for your help <insert lots of sarcasm here>
@Lupajz: thank you for trying, it wasnt the correct solution but you at least gave a serious reply unlike others