Feature: add date formatting option in custom api (#2228)

public/locales/en/common.json

@@ -10,7 +10,8 @@
         "bibitrate": "{{value, rate(bits: true; binary: true)}}",
         "percent": "{{value, percent}}",
         "number": "{{value, number}}",
-        "ms": "{{value, number}}"
+        "ms": "{{value, number}}",
+        "date": "{{value, date}}"
     },
     "widget": {
         "missing_type": "Missing Widget Type: {{type}}",