Adds character count to reply box 😳 (#1634)

* Added characters remaining to reply box

* Changed warning text for character length

* Decreased font size of message

app/javascript/dashboard/components/widgets/WootWriter/constants.js

@@ -2,3 +2,8 @@ export const REPLY_EDITOR_MODES = {
   REPLY: 'REPLY',
   NOTE: 'NOTE',
 };
+
+export const CHAR_LENGTH_WARNING = {
+  UNDER_50: 'characters remaining',
+  NEGATIVE: 'characters over',
+};