tpl: Add a delimiter parameter to lang.NumFmt

The original implementation of NumFmt did not take into account that the
options delimiter (a space) could be a valid option.  Adding a delim
parameter seems like the simplest, safest, and most flexible way to
solve this oversight in a backwards-compatible way.

Fixes #5260

content/en/functions/NumFmt.md

@@ -12,7 +12,7 @@ menu:
   docs:
     parent: "functions"
 toc: false
-signature: ["lang.NumFmt PRECISION NUMBER [OPTIONS]"]
+signature: ["lang.NumFmt PRECISION NUMBER [OPTIONS [DELIMITER]]"]
 workson: []
 hugoversion:
 relatedfuncs: []
@@ -22,7 +22,9 @@ aliases: []
 comments:
 ---
 
-The default options value is `- . ,`.
+The default options value is `- . ,`.  The default delimiter within the options
+value is a space.  If you need to use a space as one of the options, set a
+custom delimiter.
 
 Numbers greater than or equal to 5 are rounded up. For example, if precision is set to `0`, `1.5` becomes `2`, and `1.4` becomes `1`.
 
@@ -31,5 +33,6 @@ Numbers greater than or equal to 5 are rounded up. For example, if precision is
 {{ lang.NumFmt 2 12345.6789 "- , ." }} → 12.345,68
 {{ lang.NumFmt 0 -12345.6789 "- . ," }} → -12,346
 {{ lang.NumFmt 6 -12345.6789 "- ." }} → -12345.678900
+{{ lang.NumFmt 6 -12345.6789 "-|.| " "|" }} → -1 2345.678900
 {{ -98765.4321 | lang.NumFmt 2 }} → -98,765.43
 ```