changed button title as suggested in review

src/main/resources/fxml/unlock_select_masterkeyfile.fxml

@@ -34,7 +34,7 @@
 			<ButtonBar buttonMinWidth="120" buttonOrder="+CX">
 				<buttons>
 					<Button text="%generic.button.cancel" ButtonBar.buttonData="CANCEL_CLOSE" cancelButton="true" onAction="#cancel"/>
-					<Button text="%generic.button.next" ButtonBar.buttonData="NEXT_FORWARD" defaultButton="true" onAction="#proceed"/>
+					<Button text="%unlock.chooseMasterkey.chooseBtn" ButtonBar.buttonData="NEXT_FORWARD" defaultButton="true" onAction="#proceed"/>
 				</buttons>
 			</ButtonBar>
 		</VBox>

src/main/resources/i18n/strings.properties

@@ -106,6 +106,7 @@ unlock.unlockBtn=Unlock
 ## Select
 unlock.chooseMasterkey.title=Select Masterkey of "%s"
 unlock.chooseMasterkey.prompt=Could not find the masterkey file for this vault at its expected location. Please choose the key file manually.
+unlock.chooseMasterkey.chooseBtn=Choose…
 unlock.chooseMasterkey.filePickerTitle=Select Masterkey File
 ## Success
 unlock.success.message=Unlocked "%s" successfully! Your vault is now accessible via its virtual drive.