I think you are doing way too much! Just open both files with a zip-like program (I use WinRAR, but most programs will do). You already have chrome.manifest
edited, so just drag and drop these to the opened xpi, so that you overwrite the existing files with the ones you edited. Then go to the locale
folder in the xpi. This is usually within a jar file in the chrome
folder, but can also be directly in this folder. It is in a jar in this case, so extract this from the xpi and open it with the same zip program. Once in the locale
folder, just drag and drop your complete folder (called da-DK
) from the tar.gz file to the locale
folder to add it to the other locales (after this you can close the tar.gz file). Exit the jar file and drag it to the chrome
folder in the xpi, so that it overwrites the existing jar file. Now you can close the xpi, and you're set for testing!
If it still doesn't work, drop me PM or an e-mail.