HFP-3141 Fix sentences being parsed as a single word

This would happen if a sentence was wrapped in space and asterisk, e.g. ' *this is the answer* ',
which would be marked as a single word in the view, when it should be 4 words.
Adding space as an exception in the matching regex fixes this.

scripts/mark-the-words.js

@@ -93,7 +93,7 @@ H5P.MarkTheWords = (function ($, Question, Word, KeyboardNav, XapiGenerator) {
       if (node instanceof Text) {
         var text = $(node).text();
         var selectableStrings = text.replace(/( |\r\n|\n|\r)/g, ' ')
-          .match(/ \*[^\*]+\* |[^\s]+/g);
+          .match(/ \*[^\* ]+\* |[^\s]+/g);
 
         if (selectableStrings) {
           selectableStrings.forEach(function (entry) {