changed wording and removed unnecessary method calls

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

@@ -84,7 +84,7 @@ public class SupporterCertificateController implements FxController {
 
 	@FXML
 	void didClickRemoveCert() {
-		removeCert.build().showRemoveCert((Stage)window.getScene().getWindow());
+		removeCert.build().showRemoveCert(window);
 	}
 
 	public LicenseHolder getLicenseHolder() {

src/main/resources/i18n/strings.properties

@@ -343,7 +343,7 @@ preferences.contribute.sponsor=Sponsor
 ### Remove License Key Dialog
 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.description=Cryptomator’s core features are not affected by this. Neither access to your vaults is restricted nor the level of security is lowered.
 removeCert.confirmBtn=Remove
 #<-- Add entries for donations and code/translation/documentation contribution -->