Fixes a typo - Licences should be Licenses in Preferences dialog.

Author: sebastian.vallet

resources/forms/preferences.ui

@@ -1100,7 +1100,7 @@
        <bool>true</bool>
       </property>
       <attribute name="title">
-       <string>Licences</string>
+       <string>Licenses</string>
       </attribute>
       <layout class="QVBoxLayout" name="verticalLayout_3">
        <item>