How to include a field's suffix when using its Token?
AFAIK, field metadata isn't available in tokens. However, Rules to the rescue!


Create a rule set component which takes the field value as an integer parameter and two additional string parameters and provides a string value in return.
In your rule set, add a rule which checks to see if the value is one. If it is, set the provided string value with the integer value and the first string parameter.
Then, add another rule which does the same thing if the value is > 1.
Now you have a string which is pluralized!


Here is an export:

{ "rules_pluralize" : {
    "LABEL" : "Pluralize",
    "PLUGIN" : "rule set",
    "OWNER" : "rules",
    "REQUIRES" : [ "rules" ],
    "USES VARIABLES" : {
      "integer" : { "label" : "Integer", "type" : "integer" },
      "string_one" : { "label" : "One", "type" : "text" },
      "string_many" : { "label" : "Many", "type" : "text" },
      "pluralized_version" : { "label" : "Pluralized version", "type" : "text", "parameter" : false }
    },
    "RULES" : [
      { "RULE" : {
          "IF" : [ { "data_is" : { "data" : [ "integer" ], "value" : "1" } } ],
          "DO" : [
            { "data_set" : {
                "data" : [ "pluralized-version" ],
                "value" : "[integer:value] [string-one:value]"
              }
            }
          ],
          "LABEL" : "Set string for one item."
        }
      },
      { "RULE" : {
          "IF" : [
            { "data_is" : { "data" : [ "integer" ], "op" : "\u003E", "value" : "1" } }
          ],
          "DO" : [
            { "data_set" : {
                "data" : [ "pluralized-version" ],
                "value" : "[integer:value] [string-many:value]"
              }
            }
          ],
          "LABEL" : "Set string for multiple items."
        }
      }
    ],
    "PROVIDES VARIABLES" : [ "pluralized_version" ]
  }
}