We migrated from 3.4.3 to 3.6.1 and faced the following problem.
I have the following variable defined in my environment:
This variable is inherited by apache.
Now Date field in e-mails generated by RT have day of the week
represented in Russian. This was not the case with 3.4.3 version of RT.
I think it’s a bug.
The workaround is to start apache with LANG=C, but it’s only a workaround.