International system recordings

I have some System Recordings for my IVRs in several languages. At this time, for each language I have a custom file in sounds/custom/.

For example
custom/Welcome_english.wav
custom/Welcome_german.wav

It is possible to put these in the normal language sounds folders? How can I associate these files?
en/Welcome.wav
de/Welcome.wav

Not at this time. But @qwell is working on a really cool re-write of system recordings to allow a single system recording to have multiple languages so a single IVR can have more then 1 sound file attached to it and depending on what language you have set in your call flow it will play that one. This will be included in FreePBX 13 which is just Alpha now.

That really sounds very cool. I will wait for the publication. An upgrade of FreePBX 12 should not be a problem, right?