Add Strings

iOSClient/Supporting Files/en.lproj/Localizable.strings

@@ -89,6 +89,8 @@
 "_save_path_"               = "Save path";
 "_save_settings_"           = "Save settings";
 "_mode_filename_"           = "Filename mode";
+"_warning_owncloud_"        = "You are connected to an ownCloud server. This is untested and unsupported, use at your own risk. To upgrade to Nextcloud, see https://nextcloud.com/migration"
+"_warning_unsupported_"     = "You are using an unsupported version of Nextcloud. For the safety of your data we strongly recommend updating to the latest stable Nextcloud"
 
 // App