support async read method for content script

gui/scripts/read.JS

@@ -15,12 +15,14 @@ function load() {
         });
 }
 
-load();
 
 
 export default class texts {
   static universal (message_name) {
     /* Read a universal message name. */
+    
+    // Load the strings here to avoid loading inside another web page, where it is not permitted.  
+    load();
 
     let message_name_valid = messages.universal.hasOwnProperty(message_name);
 
@@ -41,3 +43,29 @@ export default class texts {
     return(message);
   }
 }
+
+export function read(source, message_name, params) {
+  /* This reads the message from its source. This is a fallback for the content scripts, who doesn't appear to read classes. 
+  
+  Parameters:
+    source: the source name, with accepted parameters "localized" and "fallback"
+    message: the message name
+  Returns: (string) the message
+  */
+
+  let message; 
+
+  // Determine if a fallback is requested
+  switch (source) {
+    case "universal": 
+    case "fallback": 
+      message = texts.universal(message_name);
+      break;
+    default: 
+      message = texts.localized(message_name, params);
+      break;
+  };
+
+  return (message);
+
+}