Task done by a Page Translator.
When translating a page from say, English to French, the English content is pasted into the French side. If the English side contains some internal links to pages that have a known French translation, then the system automatically translates the link.
For links that do not have a French transltion yet, it marks them up something like:
{TranslationOf: english link}
This special markup gets rendered as a dangling link with anchor: 'Traduction de: english link'.
See also Create a Page by Clicking on a Dangling Link to know what happens when someone clicks on that dangling link.
When translating a page from say, English to French, the English content is pasted into the French side. If the English side contains some internal links to pages that have a known French translation, then the system automatically translates the link.
For links that do not have a French transltion yet, it marks them up something like:
{TranslationOf: english link}
This special markup gets rendered as a dangling link with anchor: 'Traduction de: english link'.
See also Create a Page by Clicking on a Dangling Link to know what happens when someone clicks on that dangling link.