added better handling of modals

...er8/budgetmasterclient/ui/controller/ChartController.java

...dlocker8/budgetmasterclient/ui/controller/Controller.java

...erclient/ui/controller/LocalServerSettingsController.java

...r8/budgetmasterclient/ui/controller/ReportController.java

...r8/budgetmasterclient/ui/controller/SearchController.java

...deadlocker8/budgetmasterclient/utils/DatabaseDeleter.java

...eadlocker8/budgetmasterclient/utils/DatabaseExporter.java

...eadlocker8/budgetmasterclient/utils/DatabaseImporter.java

...de/deadlocker8/budgetmasterclient/utils/LoadingModal.java

...rces/de/deadlocker8/budgetmaster/languages/_de.properties

...rces/de/deadlocker8/budgetmaster/languages/_en.properties

...java/de/deadlocker8/budgetmaster/logic/utils/Strings.java