Fix missing spaces after commas

lib/convert-worker.js

@@ -262,6 +262,9 @@ function getBodyXML(chapter, book, contentEl) {
   xml = xml.replace(/I-I/g, "I—I");
   xml = xml.replace(/I-uh/g, "I—uh");
 
+  // Fix missing spaces after commas
+  xml = xml.replace(/([a-zA-Z]+),([a-zA-Z]+)/g, "$1, $2");
+
   // Joint names should use em dashes
   xml = xml.replace(/Dallon-Pelham/g, "Dallon–Pelham");
   xml = xml.replace(/Bet-Gimel/g, "Bet–Gimel");

lib/substitutions.json

@@ -2754,10 +2754,6 @@
       "before": "fighting.  But.",
       "after": "fighting. But…"
     },
-    {
-      "before": "r,s",
-      "after": "r, s"
-    },
     {
       "before": "—But I have",
       "after": "—but I have"