Fixed library changes not savable in free version

Serviio API parameter "accessGroupIds" was not provided with free version as UI parameter os_access_'.$id.' has been omitted.
Now, if free version is used, that parameter will always be sent with value 1, according to API.
Updated German translation
Updates for multilanguage support
Improved multilanguage support
Improved multilanguage support
Fix wrong encoding
Update messages_de.properties
Update messages_de.properties
Update messages_de.properties
Update messages_de.properties
Another fix library changes not savable in free version
Update README.txt
Updated name fields for ServiiDB
Updated ServiiDB ressource types

This should prevent all new sources from being a Feed
Corrected variable value swap for adding ServiiDB resource
Fixed typo
Fixed typo
Added logs.php to include Serviio log data

Value (log file path) for variable $serviio_log will be taken from config.php
Updated library.php to add list of installed plugins

- A little code clean up
- Added a third tab to list installed plugins
Updated config.php - Added variable for Serviio log file