I am looking for a way to customize to local language names of months and weekdays in Timeline view, located on the top of the graph. This is also applicable for names of buttons used to pick the time slot of visible part of the timeline. As database designer I am using English as preferable language in the setting of my account but users of Interfaces should see calendar's names in local language.
You can put the language in German and French (iso the standard English). That will translate those things. Other languages on "automatic", like Dutch in my case, will stay in English in my experience.