Add de_CH translation (#611)
Add de_CH translation (#611)

Region-specific translation for German (Switzerland). 

Initiated from here: https://github.com/shoelace-style/shoelace/pull/609#issuecomment-987711804
claviska/shoelace-css,shoelace-style/shoelace,shoelace-style/shoelace,claviska/shoelace-css,shoelace-style/shoelace