DEV: Remove an unused i18n string

DEV: Remove an unused i18n string

The related code was removed in 86cb5803ba07288e34fb4cd81df2fff2c61bfc21

diff --git a/config/locales/server.en.yml b/config/locales/server.en.yml
index 7343148..cfb7acd 100644
--- a/config/locales/server.en.yml
+++ b/config/locales/server.en.yml
@@ -1755,7 +1755,6 @@ en:
     png_to_jpg_quality: "Quality of the converted JPG file (1 is lowest quality, 99 is best quality, 100 to disable)."
 
     allow_staff_to_upload_any_file_in_pm: "Allow staff members to upload any files in PM."
-    convert_heif_to_jpeg: "Convert '.heic' or '.heif' image uploads to jpeg."
 
     strip_image_metadata: "Strip image metadata."
 

GitHub sha: 4f48304a