This option is usefull if you used the Language Filter plugin, stopt using it or changed the language of items. 

Then the links in your content might be wrong, this option fixes that.

You can:

• Set the language string. (If the language is not set  (*) the &lang= will be removed).
• Remove the language string, regardless of any setting.
• Off - do nothing

The Article Extractor and Checker plugin can fix the links permanently.

This  option will redirect non-sef links to there SEF version.

This is a backport from the 'System - Sef' plugin voor Joomla 5.2. 

Defaults to the URI::root()

Whenever you change the category for an article, all your links in the other content point to the wrong location. See Checking (fixing) Internal Links

This might happen if :

• a document is moved to a different category
• if a category is changed, renamed or moved in the category tree,
• assigned to a menu item,
• a menu item is changed
• if the setting Remove IDs from URLs in the Articles Integration setting is changed

Examples:

• index.php?option=com_content&view=article&catid=8&id=10 → extensions/package
• index.php?option=com_content&view=article&catid=old&id=10 → extensions/package
• extensions/10-package→ extensions/package (if settings changed)
• extensions/10-old-alias-package→ extensions/10-package
• old-menu/10-package → changed-menu/10-package

It will preserve query parts that are not part of the new path:

• index.php?option=com_content&view=article&catid=8&id=10&tmpl=component → extensions/package?tmpl=component

With this option, each article link is checked for the correct category ID and corrected.

Additionally, it will (re)set the article alias. This alias is required in the SEF process later on. I would be queried by the article router. The alias can be retrieved with the category-id in a single query, so setting it here will save a query later on.

If you have a lot of links on your pages, this will require an equal amount of database queries.  In that case, or if you do not change the categories of articles too often, you can also use similar functionality on the content extractor of the broken link checker.

Redirect if, with the previous option, a different canonical is found.

If the current page URL (path) does not match the canonical, the plugin will redirect. 

If you change the Article Integration setting Remove IDs from No to Yes, you really mess up the indexed content of your site (for search engines).

A link like https://brokenlinkchecker.dev/extensions/10-package changes to https://brokenlinkchecker.dev/extensions/package, and you will get a big 404 error on the old link. 

Enabling this option will catch 404 errors, tries to find the article and redirect to the correct one. 

Fallback: Find article by ID

In the default setting, both the ID (10 in the example above) and the alias (package) must match, this to avoid conflict with other components.

This fallback option will find articles based on the ID only, that might cause conflict with other components, like the category.

This option is only useful if you changed a lot of article aliases in the past.

Alias or category changed

Changes in the alias or category of an article are caught by the options Check Category id for articles / canonical and Redirect to correct category id

This option is intended to work with the Filter Tags Module, it will convert links like index.php?filter_tag=x to .../<slug seperator>/<id or alias>

Slug seperator

Appended to the URL before the tag itself

Convert Tag ID into Tag Alias

Convert the ID of the tag to the alias as defined in the tag component. 

This does not include parent tags! tag aliases must be unique to work.