[9.2] [Obs AI Assistant] Update Knowledge Base model label in AI Assistant settings (#239824) (#239832)

# Backport

This will backport the following commits from `main` to `9.2`:
- [[Obs AI Assistant] Update Knowledge Base model label in AI Assistant
settings (#239824)](#239824)

<!--- Backport version: 9.6.6 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sorenlouv/backport)

<!--BACKPORT [{"author":{"name":"Viduni
Wickramarachchi","email":"[email protected]"},"sourceCommit":{"committedDate":"2025-10-21T01:19:18Z","message":"[Obs
AI Assistant] Update Knowledge Base model label in AI Assistant settings
(#239824)\n\nCloses
https://github.com/elastic/kibana/issues/235256\n\n## Summary\n\nChanges
`aiAssistantResponseLanguage` to `Semantic search model`
as\n`aiAssistantResponseLanguage` doesn't represent the
correct\nfunctionality of this feature.\n\n<img width=\"926\"
height=\"326\"
alt=\"image\"\nsrc=\"https://github.com/user-attachments/assets/60343884-c6e5-467b-bb2d-4e6a68ccb62d\"\n/>\n\n###
Checklist\n\n- [x] Any text added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\nsentence case text and includes
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[x] The PR description includes the appropriate Release Notes
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the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*` labels.\n\n### Release note\n\nFixes
Knowledge base model label in AI Assistant
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AI Assistant] Update Knowledge Base model label in AI Assistant settings
(#239824)\n\nCloses
https://github.com/elastic/kibana/issues/235256\n\n## Summary\n\nChanges
`aiAssistantResponseLanguage` to `Semantic search model`
as\n`aiAssistantResponseLanguage` doesn't represent the
correct\nfunctionality of this feature.\n\n<img width=\"926\"
height=\"326\"
alt=\"image\"\nsrc=\"https://github.com/user-attachments/assets/60343884-c6e5-467b-bb2d-4e6a68ccb62d\"\n/>\n\n###
Checklist\n\n- [x] Any text added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\nsentence case text and includes
[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
[x] The PR description includes the appropriate Release Notes
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the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
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Knowledge base model label in AI Assistant
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AI Assistant] Update Knowledge Base model label in AI Assistant settings
(#239824)\n\nCloses
https://github.com/elastic/kibana/issues/235256\n\n## Summary\n\nChanges
`aiAssistantResponseLanguage` to `Semantic search model`
as\n`aiAssistantResponseLanguage` doesn't represent the
correct\nfunctionality of this feature.\n\n<img width=\"926\"
height=\"326\"
alt=\"image\"\nsrc=\"https://github.com/user-attachments/assets/60343884-c6e5-467b-bb2d-4e6a68ccb62d\"\n/>\n\n###
Checklist\n\n- [x] Any text added follows [EUI's
writing\nguidelines](https://elastic.github.io/eui/#/guidelines/writing),
uses\nsentence case text and includes
[i18n\nsupport](https://github.com/elastic/kibana/blob/main/src/platform/packages/shared/kbn-i18n/README.md)\n-
[x] The PR description includes the appropriate Release Notes
section,\nand the correct `release_note:*` label is applied per
the\n[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)\n-
[x] Review the
[backport\nguidelines](https://docs.google.com/document/d/1VyN5k91e5OVumlc0Gb9RPa3h1ewuPE705nRtioPiTvY/edit?usp=sharing)\nand
apply applicable `backport:*` labels.\n\n### Release note\n\nFixes
Knowledge base model label in AI Assistant
Setttings","sha":"790a11eb02c0e483ae07e191bb15de622bea87e0"}}]}]
BACKPORT-->

Co-authored-by: Viduni Wickramarachchi <[email protected]>

Author: kibanamachine

x-pack/platform/plugins/private/observability_ai_assistant_management/public/routes/components/settings_tab/change_kb_model.tsx

@@ -390,7 +390,13 @@ export function ChangeKbModel({
           </>
         }
       >
-        <EuiFormRow fullWidth label="aiAssistantResponseLanguage">
+        <EuiFormRow
+          fullWidth
+          label={i18n.translate(
+            'xpack.observabilityAiAssistantManagement.knowledgeBase.semanticSearchModelLabel',
+            { defaultMessage: 'Semantic search model' }
+          )}
+        >
           {selectInferenceModelDropdown}
         </EuiFormRow>
       </EuiDescribedFormGroup>