8.3.0 stable release notes update for Mandarin language support (#17530)

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# Overview

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updating stable 8.3.0 release notes to include a message for users
around the use of Mandarin in the app.

the issue: 
-users change their language to Mandarin in v8.3.0
-users downgrade their software
-the app is stuck with unsupported text (blank boxes) 

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## Changelog

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-add 2 sentences; let users know to change the app language back to
English in settings before downgrading their software

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low

app-shell/build/release-notes.md

@@ -14,7 +14,7 @@ Welcome to the v8.3.0 release of the Opentrons App! This release adds support fo
 
 ### New Features
 
-- Change the app or Flex touchscreen language to Mandarin in Settings.
+- Change the app or Flex touchscreen language to Mandarin in Settings. This feature is only supported in app v8.3.0 or higher. If you need to downgrade your software version, first change the app language back to English in Settings.
 
 ### Improved Features