Steps to reproduce the issue

1. Install catalan language pack (I did for frontend and backend).
2. Go to the control panel and let Joomla to check for updates. A pending update is shown. Click the link on the bottom left and an update for catalan language pack should appear.
3. Apply the update.
4. Go to the control panel and let Joomla to check for updates again. A pending update is reported. Click the link on the bottom left any you will see the same pending package you installed before.

Expected result

1. When the update is installed you expect to not apply it again.
2. After updating the language pack the package version should be 3.4.4.2

Actual result

1. The catalan language package is always pending of update.
2. After updating the language pack version shown on component management is 3.4.4.1

System information (as much as possible)

1. Ubuntu server on vagrant VM (found the same issue under Ubuntu server on a phisical machine)
2. Apache 2.4.16
3. PHP 5.6.14
4. MySQL 5.5
5. Joomla 3.4.8
6. Joomla Platform 13.1.0

Additional comments

There's an inconsistency between the update manifest and the downloaded package manifest. While the first says:

<update>
<name>Catalan</name>
<description>Catalan Translation of Joomla!</description>
<element>pkg_ca-ES</element>
<type>package</type>
<version>3.4.4.2</version>
<downloads>
<downloadurl type="full" format="zip">http://joomlacode.org/gf/download/frsrelease/20123/162726/ca-ES_joomla_lang_full_3.4.4v2.zip</downloadurl>
</downloads>
<targetplatform name="joomla" version="3.[012345]"/>
</update>

the second says

<version>3.4.4.1</version>

I think that fixing the package manifest will solve the issue.

Maybe the updater should take in consideration this kind of incosistencies and doesn't allow to update an extension with different versions on the update manifest and in the install manifest.