Remove i18n date order key

We are having some trouble where people are translating the `date.order` key.

These keys are supposed to have the symbols :year, :month, :day and not be translated to for exampe :año, :mes, :día

Really these keys are not needed in the translation file as rails is picking up `date.format`[1] key instead of `date.order`

So we can safely remove this problematic key

[1] https://github.com/consul/consul/blob/master/config/locales/en/rails.yml#L54

config/locales/en/rails.yml

@@ -68,10 +68,6 @@ en:
     - October
     - November
     - December
-    order:
-    - :year
-    - :month
-    - :day
   datetime:
     distance_in_words:
       about_x_hours:
@@ -224,4 +220,4 @@ en:
       long: "%B %d, %Y %H:%M"
       short: "%d %b %H:%M"
       api: "%Y-%m-%d %H"
-    pm: pm
+    pm: pm