changed release version to 1.5.4 (in 'About' tab)

resources/forms/preferences.ui

@@ -82,7 +82,7 @@
    <item row="1" column="0">
     <widget class="QTabWidget" name="mainTabWidget">
      <property name="currentIndex">
-      <number>0</number>
+      <number>7</number>
      </property>
      <widget class="QWidget" name="displayTab">
       <attribute name="title">
@@ -3175,9 +3175,9 @@ p, li { white-space: pre-wrap; }
 &lt;table border=&quot;0&quot; style=&quot;-qt-table-type: root; margin-top:4px; margin-bottom:4px; margin-left:4px; margin-right:4px;&quot;&gt;
 &lt;tr&gt;
 &lt;td style=&quot;border: none;&quot;&gt;
-&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;OpenBoard 1.5.3&lt;/span&gt;&lt;/p&gt;
+&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;OpenBoard 1.5.4&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Cantarell'; font-size:10pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
-&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;OpenBoard is copyright © 2019. All rights reserved.&lt;/span&gt;&lt;/p&gt;
+&lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;OpenBoard is copyright © 2020. All rights reserved.&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Cantarell'; font-size:10pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;
 &lt;p style=&quot; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px;&quot;&gt;&lt;span style=&quot; font-family:'Cantarell'; font-size:10pt;&quot;&gt;OpenBoard is derived from Open-Sankoré. Open-Sankoré is copyright © 2010-2015 Groupement d'Intérêt Public pour l'Education Numérique en Afrique (GIP ENA). All right reserved.&lt;/span&gt;&lt;/p&gt;
 &lt;p style=&quot;-qt-paragraph-type:empty; margin-top:0px; margin-bottom:0px; margin-left:0px; margin-right:0px; -qt-block-indent:0; text-indent:0px; font-family:'Cantarell'; font-size:10pt;&quot;&gt;&lt;br /&gt;&lt;/p&gt;