Add danish translation (#611)

i18n/da.yaml

@@ -0,0 +1,28 @@
+- id: prev_page
+  translation: "Forrige Side"
+
+- id: next_page
+  translation: "Næste Side"
+
+- id: read_time
+  translation:
+    one: "1 min"
+    other: "{{ .Count }} min"
+
+- id: toc
+  translation: "Indholdsfortegnelse"
+
+- id: translations
+  translation: "Oversættelser"
+
+- id: home
+  translation: "Start"
+
+- id: edit_post
+  translation: "Rediger"
+
+- id: code_copy
+  translation: "kopier"
+
+- id: code_copied
+  translation: "kopieret!"