Calendar locale (German) for PlantUML gantt diagrams

Question

Can someone tell me, how I can define another calendar's locale (e.g. German) for the rendered calendar parts of the nice gantt feature in plantUML

I have something like:

@startgantt
-- Vorbereitung --
Project starts 2020-12-01
[Themenfindung] starts 2020-12-01 and ends 2021-01-01
[milestone] happens at 2020-12-15
-- ... --
@endgantt

The output prints month and daynames in English:

Is it possible at all and if so how can this be changed to German.

There is nothing about this in the documentation (https://plantuml.com/de/gantt-diagram).

Answer 1

With last beta http://beta.plantuml.net/plantuml.jar you can now specify a language for the Calendar. For example:

@startgantt
Language DE
Project starts the 20th of september 2017
...
@endgantt

This will be integrated in next official release.