add feedback button to views

enzevalos_iphone/Base.lproj/Main.storyboard

enzevalos_iphone/ContactViewController.swift

enzevalos_iphone/CryptoManagementViewController.swift

enzevalos_iphone/ExportInfoViewController.swift

enzevalos_iphone/ExportViewController.swift

enzevalos_iphone/FeedbackButtonHelper.swift

enzevalos_iphone/FolderViewController.swift

enzevalos_iphone/ImportKeyOverviewController.swift

enzevalos_iphone/InboxViewController.swift

enzevalos_iphone/KeyTableViewController.swift

enzevalos_iphone/KeyViewController.swift

enzevalos_iphone/MoreInformationViewController.swift

enzevalos_iphone/PasteKeyViewController.swift

enzevalos_iphone/ReadViewController.swift

enzevalos_iphone/SecretKeyTableViewController.swift

enzevalos_iphone/SendViewController.swift

enzevalos_iphone/en.lproj/Localizable.strings