Merge branch 'master' into patch-4

Author: niccokunzmann

steps/01-01-letters.html

@@ -4,7 +4,7 @@
 lang: en
 ---
 <p>
-  You can search words for letters, determine whether they contain a certain letter.
+  You can search words for letters, and/or determine whether they contain a certain letter.
   Try it yourself. Write the the letter <span class="regex">a</span> into the field below.
 </p>
 <div class="playfield verbose">
@@ -19,5 +19,5 @@
   </ul>
 </div>
 <p>
-  if you do it right, a checkmark appears next to your regular expression.
+  If you do it right, a checkmark appears next to your regular expression.
 </p>

steps/01-02-letters.html

@@ -19,5 +19,5 @@
   </ul>
 </div>
 <p class="hint">
-  It is the letter <span class="regex">u</span> or <span class="regex">r</span>.
+  It is the letter <span class="regex">i</span>, <span class="regex">u</span>, or <span class="regex">r</span>.
 </p>

steps/03-03-or.html

@@ -8,7 +8,7 @@
   Find all words which begin with <span class="regex">f</span> or <span class="regex">k</span>.
 </p>
 <div class="playfield">
-  <!-- " f|k" also works -->
+  <!-- needs attention -->
   <input type="text" value="" class="regex" reference=" f| k">
   <div class="message"></div>
   <ul class="examples">