With all due respect, you're missing my point
I already know that all EU languages are on the EU version's disk. What I meant was, I wonder if all EU languages are on a US version's disk. You probably won't be able to test it though, because a US build of the code will disregard the bit in an EU build that reads the system language and loads the appropriate files accordingly.
I don't think I made that any clearer lol. Oh well...
Suffice to say, I'm not surprised the DLC content is on every disk despite it only being an unlock in the EU.