html export to a local directory does not longer export the description (title) of an image.
But this was exported in an earlier version running in December 2010.
The current kipi plugins version is 4.6.0-13.23

The <description> is empty, whatever the langage is ( fr-FR, or x-default, or both)
The current gallery.xml looks as :

<?xml version="1.0" encoding="UTF-8"?>
<collections>
 <collection>
  <name>AAAA</name>
  <fileName>aaaa</fileName>
  <comment></comment>
  <image>
   <title>A08_001.jpg</title>
   <description></description>
   <date>1970-12-25T09:59:27</date>
   <full fileName="a08_001_jpg.jpeg" height="1024" width="1011"/>
   <thumbnail fileName="thumb_a08_001_jpg.jpeg" height="120" width="120"/>
   
But the xmp file, when generated, shows the description, as in this example :

  <rdf:Description rdf:about=""
    xmlns:xmp="http://ns.adobe.com/xap/1.0/"
    xmlns:photoshop="http://ns.adobe.com/photoshop/1.0/"
    xmlns:digiKam="http://www.digikam.org/ns/1.0/"
    xmlns:exif="http://ns.adobe.com/exif/1.0/"
    xmlns:tiff="http://ns.adobe.com/tiff/1.0/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmp:CreatorTool="digiKam-4.5.0"
   xmp:CreateDate="1970-12-25T09:59:27"
   xmp:MetadataDate="1970-12-25T09:59:27"
   xmp:ModifyDate="1970-12-25T09:59:27"
   photoshop:Urgency="0"
   photoshop:DateCreated="1970-12-25T09:59:27"
   digiKam:PickLabel="0"
   digiKam:ColorLabel="0"
   exif:DateTimeOriginal="1970-12-25T09:59:27"
   tiff:DateTime="1970-12-25T09:59:27"
   tiff:Software="digiKam-4.8.0">
   <dc:title>
    <rdf:Alt>
     <rdf:li xml:lang="fr-FR">1970</rdf:li>
    </rdf:Alt>
   </dc:title>
  </rdf:Description>


Reproducible: Always

Steps to Reproduce:
1. select the Caption/Tags menu
2. select an image and enter a comment in the Description Title area (ie. 1970 )
3. clic on the "Apply" button or select an other image
4. select the Export to HTML menu ...
5. in the export directory, you'll find the gallery.xml

Actual Results:  
 <title>A08_001.jpg</title>
   <description></description>

Expected Results:  
 <title>A08_001.jpg</title>
   <description>1970</description>