Hello,

I made a language override for after someone applies to for a subscription, a custom message shows up on the screen. It was working for a while but now it appears it has gone back to the default "Sign up complete" message.

No it's not under there.

My language override looks like this:
'UE_REG_COMPLETE_NOAPPR_CONF' => '<div class="page-header"><h3>Membership Application Complete!</h3></div><p>Your Membership Application requires email confirmation and approval. Please follow the confirmation steps sent to you in email. Membership Applications go through an approval process with the CAG Admissions Committee as well as your CAG Sponsor (if applicable). You will be sent an acceptance notice to the e-mail address you entered.</p><p>When you receive approval, you will be prompted to log in and continue the payment process.</p>',

And it used to work but now it's gone back to the default settings (which is what it looks like in my photo that I had attached).

I just don't know what I did to make my language override not work anymore. I probably accidently turned it off somehow.

They need to pay AFTER moderator approval.

No I did the proper Language Override. I followed the steps in your video and made my own language file, named it override etc. just like you told me to. See screenshot.