Added new filters for templates (#7699)

* Added new filters for templates

* Minor fixes

source/_docs/configuration/templating.markdown

@@ -94,6 +94,9 @@ Home Assistant adds extensions to allow templates to access all of the current s
 - Filter `regex_findall_index(string, find='', index=0, ignorecase=False)` will find all regex matches of find in string and return the match at index (findall returns an array of matches).
 - Filter `bitwise_and(value_one, value_two)` perform a bitwise and(&) operation with two values.
 - Filter `bitwise_or(value_one, value_two)` perform a bitwise or(\|) operation with two values.
+- Filter `base64_encode` convert given value to a Base64 encoded string.
+- Filter `base64_decode` convert given Base64 value to a regulary string.
+- Filter `ordinal` convert a number into a speakable ordinal text.
 
 [strp-format]: https://docs.python.org/3.6/library/datetime.html#strftime-and-strptime-behavior