changes mentioned by infeo

src/main/java/org/cryptomator/ui/preferences/SupporterCertificateController.java

@@ -23,6 +23,7 @@ public class SupporterCertificateController implements FxController {
 	private static final String SUPPORTER_URI = "https://store.cryptomator.org/desktop";
 
 	private final Application application;
+	private final Stage window;
 	private final LicenseHolder licenseHolder;
 	private final Settings settings;
 	private final RemoveCertComponent.Builder removeCert;
@@ -31,8 +32,9 @@ public class SupporterCertificateController implements FxController {
 	private TextArea supporterCertificateField;
 
 	@Inject
-	SupporterCertificateController(Application application, LicenseHolder licenseHolder, Settings settings, RemoveCertComponent.Builder removeCert) {
+	SupporterCertificateController(Application application, @PreferencesWindow Stage window, LicenseHolder licenseHolder, Settings settings, RemoveCertComponent.Builder removeCert) {
 		this.application = application;
+		this.window = window;
 		this.licenseHolder = licenseHolder;
 		this.settings = settings;
 		this.removeCert = removeCert;
@@ -82,8 +84,7 @@ public class SupporterCertificateController implements FxController {
 
 	@FXML
 	void didClickRemoveCert() {
-		Stage pref = (Stage) supporterCertificateField.getScene().getWindow();
-		removeCert.build().showRemoveCert(pref);
+		removeCert.build().showRemoveCert((Stage)window.getScene().getWindow());
 	}
 
 	public LicenseHolder getLicenseHolder() {

src/main/resources/i18n/strings.properties

@@ -341,10 +341,10 @@ preferences.contribute.donate=Donate
 preferences.contribute.sponsor=Sponsor
 
 ### Remove License Key Dialog
-removeCert.title=Remove Cert
+removeCert.title=Remove Certificate
 removeCert.message=Remove supporter certificate?
 removeCert.description=Even without a supporter certificate Cryptomator stays functional and neither restrict access to your vaults nor lowers its security.
-removeCert.confirmBtn=Remove Cert
+removeCert.confirmBtn=Remove
 #<-- Add entries for donations and code/translation/documentation contribution -->
 
 ## About