Fix: pt_br translation and adding pt to knoledg-add (#4674)

### What problem does this PR solve?

Fix Portuguese (Brazil) translation
Adding portuguese to Knowledge adding settings.

### Type of change

- [X] Bug Fix (non-breaking change which fixes an issue)
- [X] New Feature (non-breaking change which adds functionality)

---------

Co-authored-by: Yingfeng <yingfeng.zhang@gmail.com>

web/src/locales/en.ts

@@ -220,6 +220,7 @@ export default {
       upload: 'Upload',
       english: 'English',
       chinese: 'Chinese',
+      portugueseBr: 'Portuguese (Brazil)',
       embeddingModelPlaceholder: 'Please select a embedding model',
       chunkMethodPlaceholder: 'Please select a chunk method',
       save: 'Save',