Language selector to forward to translated page

[HarisDotParis]

Current state: This theme only supports the header language selector to forward to the start page. Links forwarding to the translation of the page you are currently on is only available with blog entries.

Expected behaviour: Either the default or a variable enables the header language selector to forward directly to the translation of a particular page; if no translation exists, the language selector shall forward to the start page. This behaviour should work with all types of web pages.

Advantages: Simplification of navigation. Improved multilingual UX.

Disadvantages: Either changes to default behaviour, or one additional variable to keep in mind, break your config or document.

Generally speaking, thank you to the maintainer and all contributors for this great Hugo theme!