JS-8690: add translation key to correct file

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: ra3orblade

CLAUDE.md

@@ -129,6 +129,7 @@ Anytype is an Electron-based desktop application with TypeScript/React frontend
 
 ### Important Patterns
 - All UI text should use `translate()` function for i18n
+- Translation keys are defined in `src/json/text.json`
 - Block operations should go through the command system
 - Use existing utility functions in `lib/util/` before creating new ones
 - Follow existing component patterns in `component/` directory

src/json/text.json

@@ -752,6 +752,7 @@
 	"blockEmbedEmpty": "%s embed block is empty. Click to edit.",
 	"blockEmbedSource": "Source",
 	"blockEmbedOffline": "You are not connected to the Internet",
+	"blockEmbedUnsupported": "Unsupported embed. Please update the app.",
 	"blockEmbedExternalImage": "External image",
 
 	"blockTableOfContentsAdd": "Add headings to create a table of contents",