Example:
https://social.example.com/profile/example
-
- in German:
-
+
+in German:
+
https://social.example.com/profile/example?lang=de.
If the question mark is already in the url you need to do it using a ampersand.
Example:
https://social.example.com/profile/example?tab=profile
-
- in German:
-
+
+in German:
+
https://social.example.com/profile/example?tab=profile&lang=de.
When a certain language is forced, the language remains until session is closed.