Make legacy props an option disabled by default

Change-Id: Id0bb17ebd11e120b4676c41d6553e6a830ac7ee9
diff --git a/gui/theme/common/languages/en.xml b/gui/theme/common/languages/en.xml
index 5c20831..435da36 100644
--- a/gui/theme/common/languages/en.xml
+++ b/gui/theme/common/languages/en.xml
@@ -82,6 +82,7 @@
 		<string name="folder">Folder:</string>
 		<string name="file">File:</string>
 		<string name="zip_sig_chk">Zip signature verification</string>
+		<string name="enable_legacy_props_chk">Enable legacy properties for old zips</string>
 		<string name="inject_twrp_chk">Inject TWRP after install</string>
 		<string name="install_reboot_chk">Reboot after installation is complete</string>
 		<string name="options_hdr">Options</string>