VM does not take language overrides into account (e.g. el-GR-override.ini), when creating the order status e-mail titles.
We have to make the change in the file: el-GR.com_virtuemart.ini
This is an old issue, found both in two sites we manage: VM 3.2.15 and VM 3.6.3
There is not bug.
You have to make the overrides for admin and site.
Stefan
Aha! So these overrides belong to the admin?
It makes sense now... will try... thanks!