Internationalization :)

- Fix ResourceCalculator not updating on units
- Added PageMayContain to PluginMetadata model which evaluates as 'or'
operation
- Added Decorations plugin (Fun category)
- Added option to remove Help button from page
- Added TravianPLUS plugin (Utility category)
- Added 'Select all' option for reports and messages
- Implemented internationalization
- Added en (English)
- Added hr (Hrvatski/Croatian)
- PluginsManager
- Added timed registration (<20ms recommended)