tpl: Modify tpl.humanize to ordinalize integer input

Add logic to tpl.humanize such that it understands input of int literals
or strings which represent an integer. When tpl.humanize sees this type
of input, it will use inflect.Ordinalize as opposed to the standard
inflect.Humanize.

Fixes #1886

content/templates/functions.md

@@ -450,12 +450,15 @@ Used in the [highlight shortcode](/extras/highlighting/).
 
 
 ### humanize
-Humanize returns the humanized version of a string with the first letter capitalized.
+Humanize returns the humanized version of an argument with the first letter capitalized.
+If the input is either an int64 value or the string representation of an integer, humanize returns the number with the proper ordinal appended.
 
 e.g.
 ```
 {{humanize "my-first-post"}} → "My first post"
 {{humanize "myCamelPost"}} → "My camel post"
+{{humanize "52"}} → "52nd"
+{{humanize 103}} → "103rd"
 ```