Feat: Cross-language query #7376 #4503 #5710 #7470 (#7554)

### What problem does this PR solve?

Feat: Cross-language query #7376 #4503  #5710 #7470
### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/locales/en.ts

@@ -106,7 +106,8 @@ export default {
       disabled: 'Disable',
       action: 'Action',
       parsingStatus: 'Parsing Status',
-      parsingStatusTip: 'Document parsing time varies based on several factors. Enabling features like Knowledge Graph, RAPTOR, Auto Question Extraction, or Auto Keyword Extraction will significantly increase processing time. If the progress bar stalls, please consult these two FAQs: https://ragflow.io/docs/dev/faq#why-does-my-document-parsing-stall-at-under-one-percent.',
+      parsingStatusTip:
+        'Document parsing time varies based on several factors. Enabling features like Knowledge Graph, RAPTOR, Auto Question Extraction, or Auto Keyword Extraction will significantly increase processing time. If the progress bar stalls, please consult these two FAQs: https://ragflow.io/docs/dev/faq#why-does-my-document-parsing-stall-at-under-one-percent.',
       processBeginAt: 'Begin at',
       processDuration: 'Duration',
       progressMsg: 'Progress',
@@ -542,6 +543,8 @@ This auto-tagging feature enhances retrieval by adding another layer of domain-s
         'If an API key is correctly set here, Tavily-based web searches will be used to supplement knowledge base retrieval.',
       tavilyApiKeyMessage: 'Please enter your Tavily API Key',
       tavilyApiKeyHelp: 'How to get it?',
+      crossLanguage: 'Cross-language search',
+      crossLanguageTip: `Select one or more languages for cross‑language search. If no language is selected, the system searches with the original query.`,
     },
     setting: {
       profile: 'Profile',