Description: The src/messages/kendo.messages.da-DK.js file only translates the search key in the FilterMultiCheck block, while the full set has 9 keys. The remaining 8 keys fall back to English.
The missing keys:
"checkAll": "Vælg alle",
"clearAll": "Ryd alle",
"clear": "Nulstil",
"filter": "Filter",
"cancel": "Annuller",
"selectedItemsFormat": "{0} elementer valgt",
"done": "Udført",
"into": "i"

I will fix this my self after the CLA is confirmed.