Edouard Tisserant <edouard.tisserant@gmail.com> [Tue, 09 Feb 2021 07:55:16 +0100] rev 3129
SVGHMI: Add "lang" permament persistent HMI_LOCAL variable to reflect selected language, apply stored language choice at startup and make it always subscribed to a pseudo widget (as for hearbeat) that apply language choice when it changes.