Change wording of file derivative setting

Author: Floppy

config/locales/settings/en.yml

@@ -68,7 +68,7 @@ en:
         description: Manyfold can create alternative versions of some files to increase site performance. Note that this will use more disk space.
         heading: File Derivatives
         images:
-          help: Generates lower-resolution versions of images that will load quicker on list and model pages.
+          help: Generates static images of models and low-resolution image previews that will load quicker on list and model pages.
           label: Image thumbnails
       description: Manyfold will generate ZIP files of models on request, but for busy sites you may want these available more quickly. Here you can tell Manyfold to create ZIP files immediately, and also set how long they are kept in the download cache. Beware; this may use a lot of disk space!
       expiry: