fix(deep-research): apply search language correctly

components/DeepResearch/DeepResearch.vue

@@ -40,6 +40,7 @@
 
   const toast = useToast()
   const { t, locale } = useI18n()
+  const { config } = useConfigStore()
   const isLargeScreen = useMediaQuery('(min-width: 768px)')
 
   const flowRef = ref<InstanceType<typeof Flow>>()
@@ -278,6 +279,7 @@
         breadth,
         maxDepth: form.value.depth,
         languageCode: locale.value,
+        searchLanguageCode: config.webSearch.searchLanguage,
         learnings: existingLearnings,
         visitedUrls: existingVisitedUrls,
         onProgress: handleResearchProgress,

components/DeepResearch/SearchFlow.vue

@@ -103,7 +103,6 @@
   }
 
   function reset() {
-    console.warn('reset')
     layoutGraph()
     hasUserInteraction = false
   }

lib/deep-research.ts

@@ -218,6 +218,7 @@ export async function deepResearch({
   breadth,
   maxDepth,
   languageCode,
+  searchLanguageCode,
   learnings = [],
   visitedUrls = [],
   onProgress,
@@ -228,8 +229,10 @@ export async function deepResearch({
   query: string
   breadth: number
   maxDepth: number
-  /** Language code for SERP queries and web searches */
+  /** The language of generated response */
   languageCode: Locale
+  /** The language of SERP query */
+  searchLanguageCode?: Locale
   /** Accumulated learnings from all nodes visited so far */
   learnings?: string[]
   /** Accumulated visited URLs from all nodes visited so far */
@@ -243,6 +246,9 @@ export async function deepResearch({
 }): Promise<ResearchResult> {
   const { t } = useNuxtApp().$i18n
   const language = t('language', {}, { locale: languageCode })
+  const searchLanguage = searchLanguageCode
+    ? t('language', {}, { locale: searchLanguageCode })
+    : undefined
   const globalLimit = usePLimit()
 
   try {
@@ -266,7 +272,7 @@ export async function deepResearch({
         learnings,
         numQueries: breadth,
         language,
-        searchLanguage: language,
+        searchLanguage,
       })
 
       for await (const chunk of parseStreamingJson(