implemented a 'Share Vault' button in vault_detail_locked and added a new window for vault sharing options

src/main/resources/fxml/share_vault.fxml

@@ -0,0 +1,64 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.ButtonBar?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.layout.Region?>
+<?import javafx.scene.layout.VBox?>
+<?import javafx.scene.layout.HBox?>
+<?import javafx.scene.layout.StackPane?>
+<?import javafx.scene.shape.Circle?>
+<?import org.cryptomator.ui.controls.FontAwesome5IconView?>
+<?import javafx.scene.image.ImageView?>
+<?import javafx.scene.image.Image?>
+<VBox xmlns:fx="http://javafx.com/fxml"
+	  xmlns="http://javafx.com/javafx"
+	  fx:controller="org.cryptomator.ui.sharevault.ShareVaultController"
+	  prefWidth="600"
+	  spacing="12"
+	  alignment="CENTER_LEFT">
+	<padding>
+		<Insets topRightBottomLeft="24"/>
+	</padding>
+	<HBox spacing="12" VBox.vgrow="NEVER">
+		<StackPane HBox.hgrow="NEVER">
+			<Circle styleClass="glyph-icon-primary" radius="24"/>
+			<FontAwesome5IconView styleClass="glyph-icon-white" glyph="INFO" glyphSize="24"/>
+		</StackPane>
+		<VBox spacing="6" HBox.hgrow="ALWAYS" visible="${controller.hubVault}" managed="${controller.hubVault}">
+			<Label text="%shareVault.hub.message" styleClass="label-extra-large" wrapText="true"/>
+			<Label text="%shareVault.hub.instruction.0" wrapText="true"/>
+			<Label text="%shareVault.hub.instruction.1" wrapText="true"/>
+			<Label text="%shareVault.hub.instruction.2" wrapText="true"/>
+		</VBox>
+		<VBox spacing="12" HBox.hgrow="ALWAYS" visible="${!controller.hubVault}" managed="${!controller.hubVault}">
+			<Label text="%shareVault.message" styleClass="label-extra-large" wrapText="true"/>
+			<Label text="%shareVault.description" wrapText="true"/>
+			<Label text="%shareVault.instruction.0" wrapText="true"/>
+			<Label text="%shareVault.instruction.1" wrapText="true"/>
+			<Label text="%shareVault.more" wrapText="true"/>
+			<HBox spacing="6" style="-fx-padding: 10px; -fx-background-color: white; -fx-border-color: #dddddd; -fx-border-width: 2px; -fx-border-radius: 5px;">
+				<VBox spacing="6" alignment="CENTER_LEFT">
+					<Label text="%shareVault.info.1" style="-fx-font-weight: bold;" wrapText="true"/>
+					<Label text="%shareVault.info.2" wrapText="true"/>
+					<Label text="%shareVault.info.3" wrapText="true"/>
+					<Label text="%shareVault.info.4" wrapText="true"/>
+					<Label text="%shareVault.info.5" wrapText="true"/>
+				</VBox>
+				<Region HBox.hgrow="ALWAYS"/>
+				<ImageView HBox.hgrow="ALWAYS" fitWidth="200" preserveRatio="true" cache="true">
+					<Image url="@../img/share-hub-logo.png"/>
+				</ImageView>
+			</HBox>
+		</VBox>
+	</HBox>
+	<Region VBox.vgrow="ALWAYS"/>
+	<ButtonBar buttonMinWidth="120" buttonOrder="+CX">
+		<buttons>
+			<Button text="%generic.button.close" ButtonBar.buttonData="CANCEL_CLOSE" onAction="#close"/>
+			<Button text="%shareVault.hub.openHub" ButtonBar.buttonData="NEXT_FORWARD" defaultButton="true" onAction="#openHub" visible="${controller.hubVault}" managed="${controller.hubVault}"/>
+			<Button text="%shareVault.visitHub" ButtonBar.buttonData="NEXT_FORWARD" defaultButton="true" onAction="#visitHub" visible="${!controller.hubVault}" managed="${!controller.hubVault}"/>
+		</buttons>
+	</ButtonBar>
+</VBox>

src/main/resources/fxml/vault_detail_locked.fxml

@@ -24,6 +24,11 @@
 				<FontAwesome5IconView glyph="KEY" glyphSize="15"/>
 			</graphic>
 		</Button>
+		<Button text="%main.vaultDetail.share" minWidth="120" onAction="#share">
+			<graphic>
+				<FontAwesome5IconView glyph="SHARE" glyphSize="15"/>
+			</graphic>
+		</Button>
 		<Hyperlink text="%main.vaultDetail.passwordSavedInKeychain" visible="${controller.passwordSaved}" onAction="#showKeyVaultOptions">
 			<graphic>
 				<FontAwesome5IconView glyph="LOCK"/>

src/main/resources/i18n/strings.properties

@@ -387,6 +387,7 @@ main.vaultDetail.unlockBtn=Unlock…
 main.vaultDetail.unlockNowBtn=Unlock Now
 main.vaultDetail.optionsBtn=Vault Options
 main.vaultDetail.passwordSavedInKeychain=Password saved
+main.vaultDetail.share=Share...
 ### Unlocked
 main.vaultDetail.unlockedStatus=UNLOCKED
 main.vaultDetail.accessLocation=Your vault's contents are accessible here:
@@ -524,4 +525,24 @@ updateReminder.message=Check for Updates?
 updateReminder.description=Stay updated with new features, bug fixes, and security improvements. We recommend to automatically check for updates.
 updateReminder.notNow=Not Now
 updateReminder.yesOnce=Yes, Once
-updateReminder.yesAutomatically=Yes, Automatically
+updateReminder.yesAutomatically=Yes, Automatically
+
+# Share Vault
+shareVault.title=Share Vault
+shareVault.message=Would you like to share your vault with others?
+shareVault.description=Always be careful when sharing your vault with other people. In short, follow these steps:
+shareVault.instruction.0=To encrypt files, follow these steps:
+shareVault.instruction.1=1. Share access of the encrypted vault folder via cloud storage.\n2. Share vault password in a secure way.
+shareVault.more=For more information, check out our best practices.
+shareVault.info.1=The secure way to work in teams
+shareVault.info.2=Use Cryptomator Hub!
+shareVault.info.3=• Zero-knowledge key management
+shareVault.info.4=• Strong authentication
+shareVault.info.5=• ...
+shareVault.visitHub=Visit Cryptomator Hub
+
+shareVault.hub.message=How to share a Hub vault
+shareVault.hub.instruction.0=In order to share the vault content with another team member, you have to perform two steps:
+shareVault.hub.instruction.1=1. Share access of the encrypted vault folder via cloud storage.
+shareVault.hub.instruction.2=2. Grant access to team member in Cryptomator Hub.
+shareVault.hub.openHub=Open Cryptomator Hub