add upToDateLabel and fix update indicator issue

src/main/resources/fxml/preferences_updates.fxml

@@ -42,6 +42,11 @@
 			</Label>
 			<Hyperlink styleClass="hyperlink-underline" text="%preferences.general.debugDirectory" onAction="#showLogfileDirectory"/>
 		</HBox>
+		<Label fx:id="upToDateLabel" text="%preferences.updates.upToDate" managed="false" visible="false">
+			<graphic>
+				<FontAwesome5IconView glyphSize="12" styleClass="glyph-icon-primary" glyph="CHECK"/>
+			</graphic>
+		</Label>
 		<Hyperlink text="${linkLabel.value}" onAction="#visitDownloadsPage" textAlignment="CENTER" wrapText="true" styleClass="hyperlink-underline" visible="${controller.updateAvailable}" managed="${controller.updateAvailable}"/>
 	</VBox>
 </VBox>

src/main/resources/i18n/strings.properties

@@ -324,6 +324,7 @@ preferences.updates.checkNowBtn=Check Now
 preferences.updates.updateAvailable=Update to version %s available.
 preferences.updates.lastUpdateCheck=The last update check was performed on: %s
 preferences.updates.checkFailed=Check failed
+preferences.updates.upToDate=Cryptomator is up-to-date.
 
 ## Contribution
 preferences.contribute=Support Us