Please add option to show KW in ISO 8601

### Please confirm these before moving forward - [x] I have searched for my feature proposal and not found a work-in-progress/duplicate/resolved/discarded issue. - [x] This improvements refers to an existing feature. If you want to suggest a new feature, please use [this template](https://github.com/marticliment/ElevenClock/issues/new?assignees=marticliment&labels=new-feature&projects=&template=feature-request.yml&title=%5BFEATURE+REQUEST%5D+%28Enter+your+description+here%29). - [x] This improvements is not a bug. If you want to report a bug, please use [this template](https://github.com/marticliment/ElevenClock/issues/new?assignees=marticliment&labels=bug&projects=&template=bug-issue.yml&title=%5BBUG%5D+%28Enter+your+description+here%29). ### Describe the improvement The KW Value in Germany is wrong we need the ISO 8601, can you please add this ♥️ ### Describe how this improvement could help users for many people to have the KW in the Taskbar!