Consistently named the entire solution TxTranslation instead of TxLib

* Changed XAML XML namespace from "http://dev.unclassified.de/source/txlib" to "http://dev.unclassified.de/source/txtranslation"
* Updated website URL
* Using AssemblyConfigurationAttribute
Fixed accepted problem icon (green) not being set on loading a dictionary
Removed unnecessary log warning; Explained suggestions in the panel
Fix: The comments indicator in the toolbar was sometimes switched on while loading a dictionary