Fixed #229 - make load alert closeable

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

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

...dgetmasterclient/ui/controller/ExportChartController.java

...er8/budgetmasterclient/ui/controller/ModalController.java

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

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

...ui/controller/settings/LocalServerSettingsController.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

.../resources/de/deadlocker8/budgetmaster/ui/fxml/Modal.fxml

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