Localization save only changed files and more.

Support localized format strings.
Save localization strings also automatically, force save button further existing.
Fix change check
Localize VirtualListBox
Consider changes also for new added elements
Some more localization preparations
Fix localization of initially created widgets
Add TreeView convinience
Add (automatic) translation button, add some transations
Add "Translate All"
Refacturing, export some classes in its own files
Some more localizations
Move WebClient (pimped with proxy) to other depot, need access everywhere