feat: Add RTL support in public help center (#11692)

# Pull Request Template

## Description

This PR adds RTL support in public help center.

Fixes
https://linear.app/chatwoot/issue/CW-4459/support-for-rtl-in-public-help-center

## Type of change

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

## How Has This Been Tested?

### Loom video

https://www.loom.com/share/d48a26ec80e04545addca825882b4d79?sid=aa7a6b37-33bc-4f63-b1cc-54b27a7733cf

## Checklist:

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented on my code, particularly in hard-to-understand
areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published in downstream
modules

app/javascript/portal/portalHelpers.js

@@ -8,6 +8,7 @@ import slugifyWithCounter from '@sindresorhus/slugify';
 import PublicArticleSearch from './components/PublicArticleSearch.vue';
 import TableOfContents from './components/TableOfContents.vue';
 import { initializeTheme } from './portalThemeHelper.js';
+import { getLanguageDirection } from 'dashboard/components/widgets/conversation/advancedFilterItems/languages.js';
 
 export const getHeadingsfromTheArticle = () => {
   const rows = [];
@@ -114,10 +115,19 @@ export const InitializationHelpers = {
     });
   },
 
+  setDirectionAttribute: () => {
+    const portalElement = document.getElementById('portal');
+    if (!portalElement) return;
+
+    const locale = document.querySelector('.locale-switcher')?.value;
+    portalElement.dir = locale && getLanguageDirection(locale) ? 'rtl' : 'ltr';
+  },
+
   initializeThemesInPortal: initializeTheme,
 
   initialize: () => {
     openExternalLinksInNewTab();
+    InitializationHelpers.setDirectionAttribute();
     if (window.portalConfig.isPlainLayoutEnabled === 'true') {
       InitializationHelpers.appendPlainParamToURLs();
     } else {