FRED bug: $Display Name deleted on mission save

[Achille44]

On mission files, $Display Name for ships is required for translations, but FRED deletes it when saving the file.

Steps to reproduce:

1. Open any mission file with a text editor and add a $Display Name below any ship:

$Name: Beta 1		;! Object #0
$Display Name: XSTR("Beta 1", -1)

2. Open the mission with FRED, and just save. Now the $Display Name is gone.

[Goober5000]

This is working as designed. The removal of $Display Name, in cases where the display name and the actual name are identical, is required for other reasons.

Translation support is a legitimate reason to keep the $Display Name in place though, so this will require some thought.

[naomimyselfandi]

What other reasons is it required for?

[Goober5000]

I don't remember exactly, and #2710 doesn't completely describe the rationale. I'll have to try to reconstruct the thought process. I do remember that the current display-name behavior was the result of extensive testing and juggling several requirements among several mods. I'm fairly sure Series Resurrecta was one, and I think NeonShivan's mod was another.