Update localised-routing.md

[shivan-s]

Closes opral/inlang.com#114

Hopefully, made is easier to understand language negotiation and how it relates to prefixing the default language.

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[shivan-s]

I have read the CLA Document and I hereby sign the CLA

[shivan-s]

No longer required. See opral/inlang.com#114 (comment)