Update userguide and welcome pages.

This is the first userguide export on the Postgres-based translation tool
(previously it used MySQL), so please double-check it extra carefully.
(I spotted a few minor problems in the export and fixed the relevant
bugs already.)

docs/userguide/uk/applications/diskusage.html

@@ -61,7 +61,7 @@
 
 <h2><img src="../../images/apps-images/diskusage-icon_64.png" alt="diskusage-icon_64.png" width="64" height="64" />DiskUsage</h2>
 <table summary="layout" border="0" cellspacing="0" cellpadding="2">
-<tr><td>Deskbar:</td><td style="width:15px;"></td><td><span class="menu">Додатки (Applications)</span></td></tr>
+<tr><td>Deskbar:</td><td style="width:15px;"></td><td><span class="menu">Applications (Додатки)</span></td></tr>
 <tr><td>Розташування:</td><td></td><td><span class="path">/boot/system/apps/DiskUsage</span></td></tr>
 <tr><td>Налаштування:</td><td></td><td><span class="path">~/config/settings/DiskUsage</span></td></tr>
 </table>