Qt: minor grammar and orthography fixes

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/gui/qt4/ui/about.ui

@@ -114,7 +114,7 @@ background-color: rgb(245, 245, 245);</string>
              <string notr="true">padding-right: 20px;</string>
             </property>
             <property name="text">
-             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;VLC media player is a free and open source media player, encoder and streamer made by the volunteers of the &lt;a href=&quot;http://www.videolan.org/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0057ae;&quot;&gt;VideoLAN&lt;/span&gt;&lt;/a&gt; community.&lt;/p&gt;&lt;p&gt;VLC uses its internal codecs and works on essentially every popular platform and can read almost every files, CDs, DVDs, network streams, capture cards and other media formats!&lt;/p&gt;&lt;p&gt;&lt;a href=&quot;http://www.videolan.org/contribute/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0057ae;&quot;&gt;Help and join us!&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+             <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;VLC media player is a free and open source media player, encoder, and streamer made by the volunteers of the &lt;a href=&quot;http://www.videolan.org/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0057ae;&quot;&gt;VideoLAN&lt;/span&gt;&lt;/a&gt; community.&lt;/p&gt;&lt;p&gt;VLC uses its internal codecs, works on essentially every popular platform, and can read almost all files, CDs, DVDs, network streams, capture cards and other media formats!&lt;/p&gt;&lt;p&gt;&lt;a href=&quot;http://www.videolan.org/contribute/&quot;&gt;&lt;span style=&quot; text-decoration: underline; color:#0057ae;&quot;&gt;Help and join us!&lt;/span&gt;&lt;/a&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
             </property>
             <property name="alignment">
              <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignTop</set>