Add dev blog about changes to icon translations (#2290)

* Add dev blog about changes to icon translations

* Address review comments

* Update blog/2024-08-27-changed-icon-translations-schema.md

Co-authored-by: Teemu R. <tpr@iki.fi>

* Address review comments

* Update 2024-08-27-changed-icon-translations-schema.md

* Update 2024-08-27-changed-icon-translations-schema.md

Apply suggestion from code review

* Update 2024-08-27-changed-icon-translations-schema.md

Update link

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Co-authored-by: Teemu R. <tpr@iki.fi>

blog/2024-08-27-changed-icon-translations-schema.md

@@ -0,0 +1,33 @@
+---
+author: Erik Montnemery
+authorURL: https://github.com/emontnemery
+title: "Changes to the icon translations schema"
+---
+
+The icon translations schema has been adjusted to allow assigning icons for [sections in services](/docs/dev_101_services/#grouping-of-service-action-fields).
+Icons for services should now be provided according to a more explicit schema, which allows specifying icons for sections.
+
+This allows specifying service icons like this:
+```json
+  "services": {
+    "test_service_1": {
+      "service": "mdi:flask",
+      "sections": {
+        "section_1": "mdi:test-tube"
+      }
+    }
+  }
+```
+
+The old format is supported during a deprecation period of one year, to give time for custom integrations to migrate to the new schema:
+```json
+  "services": {
+    "test_service_1": "mdi:flask"
+  }
+```
+
+See [core PR #124656](https://github.com/home-assistant/core/pull/124656) for implementation details.
+
+### Impact on custom cards
+
+Icons data sent to the frontend will always be according to the new format, custom cards displaying service icons need to be adjusted.