I've tried to install the Hungarian localization, but after upload it says

Upload showPlugins - Upload Error
Failed to move uploaded file to /media directory

what should I do?

I have the same problem.

I wasn't able to install the German package either.
(Same error message.)

Got a solution!

Steps of a successful install of the hungarian langauage files:
- find the <yoursite>/components/com_comprofiler/plugin
directory
- extract the installation package here to its own subdirectory
eg.
<yoursite>/components/com_comprofiler/plugin/hungarian
--> now this directory yhould contain these files:
calendar-locals.js
hungarian.php
hungarian.xml
index.html
plus an "images" subdirectory
- now go to the administrator page of your site
- find Components/CB/plugin management
- scroll down to the installation section
- go to the "Install from directory" field and type in the new subdirectory
It looks like this on my localhost:
C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\<mysite>/components/com_comprofiler/plugin/hungarian
- click Intall -> and voila!