[Résolu] Language change is not persistent

Background of the issue:
I am trying to ensure that when I select a secondary language (English) on my site lien caché, the language persists as I navigate through internal links.

Symptoms:
When I select English and follow any internal links, the page reverts to the default language (Spanish) instead of staying in English.

Questions:
How can i make this change so my users don't have to switch each time they navigate to a different page.