[Initiatives.wiki] Update Update App Screenshots

[Sophie Herold <sophieherold src gnome org>]

commit 94cec7bc129fa92497366192e823543c83555ea7
Author: Sophie Herold <sophie hemio de>
Date:   Thu Feb 24 16:49:15 2022 +0000

    Update Update App Screenshots

 Update-App-Screenshots.md | 6 ++++++
 1 file changed, 6 insertions(+)
---
diff --git a/Update-App-Screenshots.md b/Update-App-Screenshots.md
index 0fb816e..4003c2c 100644
--- a/Update-App-Screenshots.md
+++ b/Update-App-Screenshots.md
@@ -18,6 +18,12 @@
 - Having mnemonics or focus indicators visible
 - Duplicating the same screenshot for light/dark mode until [this is explicitly 
supported](https://github.com/ximion/appstream/issues/304)
 
+## Future Work
+
+#### Captions
+
+Currently not supported on Flathub and too close to string freeze for adding them for 42. However, captions 
should be reconsidered in the future.
+
 ## Help
 
 #### Removing .devel indicator