Changelog and release notes for image deduplication

CHANGELOG.txt

@@ -54,6 +54,7 @@ Changelog
  * Move page meta information from the header to a new status side panel component inside of the page editing UI (Steven Steinwand, Karl Hobley)
  * Add useful help text to Tag fields to advise what content is allowed inside tags, including when `TAG_SPACES_ALLOWED` is `True` or `False` (Abdulmajeed Isa)
  * Change `AbstractFormSubmission`'s `form_data` to use JSONField to store form submissions (Jake Howard)
+ * Add image duplicate detection on upload (Tidiane Dia, with sponsorship from The Motley Fool)
  * Fix: When using `simple_translations` ensure that the user is redirected to the page edit view when submitting for a single locale (Mitchel Cabuloy)
  * Fix: When previewing unsaved changes to `Form` pages, ensure that all added fields are correctly shown in the preview (Joshua Munn)
  * Fix: When Documents (e.g. PDFs) have been configured to be served inline via `WAGTAILDOCS_CONTENT_TYPES` & `WAGTAILDOCS_INLINE_CONTENT_TYPES` ensure that the filename is correctly set in the `Content-Disposition` header so that saving the files will use the correct filename (John-Scott Atlakson)

docs/releases/3.0.md

@@ -48,10 +48,14 @@ With every Wagtail Page you are able to add a helpful description text, similar
 
 ```python
 class LandingPage(Page):
-    
+
     page_description = "Use this page for converting users"
 ```
 
+### Image duplicate detection
+
+Trying to upload an image that's a duplicate of one already in the image library will now lead to a confirmation step. This feature was developed by Tidiane Dia and sponsored by The Motley Fool.
+
 ### Other features
 
  * Upgrade ESLint and Stylelint configurations to latest shared Wagtail configs (Thibaud Colas, Paarth Agarwal)