Draft: Restore using prefered browser language for the UI
Ref #361
Implemented in the old UI, but lost during the ui migration.
The original issue is #138 (closed).
For reference, the old implementation (done at server side): https://gitlab.com/lightmeter/controlcenter/-/blob/release/1.0.0/i18n/wrapper.go#L140
Edited by Leandro Santiago