Updated user guide.

* Added Maciej Baluta's GCI work on NetworkStatus, PowerStatus and
  ProcessController with only minor changes.
* Created a page for Daniel Marth's GCI work, based on the wiki page at
  https://dev.haiku-os.org/wiki/SystemBinCommands
* Updated translations mostly for Japanese and Italian from the currently 
  running GCI tasks.

Thanks everyone!


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39724 a95241bf-73f2-0310-859d-f6bbb57e9c96

docs/userguide/jp/tracker.html

@@ -51,7 +51,7 @@
 
 
 <table class="index" id="index" summary="index">
-<tr class="heading"><td>Index</td></tr>
+<tr class="heading"><td>目次</td></tr>
 <tr class="index"><td>
 	<a href="#mounting-volumes">Mounting volumes</a><br />
 	<a href="#navigating">Navigating</a><br />
@@ -64,7 +64,7 @@
 
 <h1>Tracker</h1>
 
-<p>The Tracker is the graphical interface to all your files. It let's you create new files and folders or find, launch or rename as well as copy or delete existing ones.</p>
+<p>The Tracker is the graphical interface to all your files. It lets you create new files and folders or find, launch or rename as well as copy or delete existing ones.</p>
 <p>Being an application like any other (the Desktop with its icons is really just a fullscreen window in the background), Tracker appears with its windows in the Deskbar and can be quit and restarted. The easiest way to quit and restart a crashed or frozen Tracker (or a wayward Deskbar) is to call the <a href="teammonitor.html">Team Monitor</a>.</p>
 
 <h2>