Fix some typos. Closes issue #47.

common/content/javascript.js

@@ -618,7 +618,7 @@ const JavaScript = Module("javascript", {
         "isXMLName", "parseFloat", "parseInt", "undefined", "uneval"
     ].concat([k.substr(6) for (k in keys(Ci)) if (/^nsIDOM/.test(k))])
      .concat([k.substr(3) for (k in keys(Ci)) if (/^nsI/.test(k))])
-     .concat(JavaScript.magicalnames)
+     .concat(JavaScript.magicalNames)
      .filter(function (k) k in window))),
 
     /**

common/locale/en-US/eval.xml

@@ -156,7 +156,7 @@
     <tags>:unl :unlet</tags>
     <spec>:unl<oa>et</oa><oa>!</oa> <a>name</a> …</spec>
     <description>
-        <deprecated>All scripts which make use of <ex>:let</ex> should be
+        <deprecated>All scripts which make use of <ex>:unlet</ex> should be
             updated to use the simpler and more powerful options system
             instead.</deprecated>
         <p>

common/locale/en-US/options.xml

@@ -1263,7 +1263,7 @@
     <type>number</type>
     <default>2</default>
     <description>
-        <p>Controls when to the tab line is shown.</p>
+        <p>Controls when the tab line is shown.</p>
 
         <p>Possible values are:</p>