You can use Hex Workshop or 010 Editor (or any other Hex program). Within the hex are the words. Umm how to explain this
So after you've extracted the EBOOT.BIN from the pkg using Sony SDK 'make_package_npdrm' or the app that was released a week ago - PKGView
Example I'll use is the Backup Manager. You open it with hex editor. I'll be using Hex Workshop, let me know if you'd prefer another one and I can explain that if possible. At the start you'll see, on the right are number 53 42 45 00 etc etc - note those numbers make up SCE. Scroll down you eventually see [offset 330368 [0x00050A80] again numbers on your right, and on the left 'Are you sure you want to delete the selected game?' these words translate to hex. If I was to change the capital A (41) to a small a, it'll become 61. I'm not an expert on hex stuff, I just like to have a look and suss out random patterns that might lead to clues. So with regard to changing the LAUN12345, you just type over it
On the right you'll see 4C 41 55 4E 31 32 33 34 35 [LAUN12345] so now by changing to ie NPEA90027 it'll now show 4E 50 45 41 30 30 32 37
Some EBOOT.BIN might not show words, but most do as they are the main executable, so therefore they need to display the errors that the end user may encounter, or secret msg, or words telling the end user info regarding the program. Some will also have the directories that it needs to install to - ie Backup Manager
From memory you won't see any words hex editing the PKG as it's just a container, like rar, zip etc - except for the name of the pkg at the start.
Hope this helps racer0018, and sorry for the late reply.