Installing Additional Language Packs:

1- Go to 'Site administration', scroll down to the 'Language' in general section and click on 'Language packs'.

2- In the Available language packs section, choose the language you want to install. Click on 'Install selected language pack(s)' to proceed.

3- After installation, the page will refresh, and a notification will appear confirming that the language pack with the code “code_of_language” has been successfully installed.

4- Navigate back to 'Site administration' and choose the 'Development section'. Click on 'Purge caches', followed by 'Purge all caches', to ensure that all the changes are properly applied.

- Multi-Language Filter Compatibility:

1- Go to 'Site administration' then 'Plugins section', scroll down to the 'Filters' section and click on 'Manage filters'.

2- Locate the 'Multi-language content' option. Change the setting from 'Disabled' to 'On'.

3- Update the filter settings to apply to both 'Content and Headings'.

4- Navigate back to 'Site administration' and choose the 'Development section'. Click on 'Purge caches', followed by 'Purge all caches', to ensure that all the changes are properly applied.

The below code is an example on how to use multi-language filter:

<span class="multilang" lang="en">Hello</span>
<span class="multilang" lang="fr">Bonjour</span>
<span class="multilang" lang="ar">مرحبا</span>