Updated Kanban translation

[Silverfalls]

Updated the German translation of the Kanban component and some related translations

Description of all changes:

• Added the translation for Kanban_No_Cards for the text that is displayed when no cards are presented
• Changed the translation for Kanban_AddTitle and Kanban_EditTitle (Kanban_EditTitle had the German for adding a card and Kanban_AddTitle was English)
• Changed Kanban_Items from Artikel wich is something that you sell in German to Element which is more fitting
• Changed Kanban_Min from Mindest to Min (abbreviation)
• Changed Kanban_Save from sparen which is saving money to Speichern and changed it on every occurence of save
• Changed Kanban_Cancel from Stornieren to Abbrechen as this is more commonly using in software applications

[rajendranr-5483]

Thanks @Silverfalls ,

Since the PR had conflicted, we extracted the changes and merged it.

Regards, Rajendran R.