Add info that flashing AB zip will flash to the inactive slot

Also inform user, that a reboot is required to switch slots

Change-Id: I7d609ee3d231e5d38d9145962e979e012d9a0ac8
(cherry picked from commit 5343a3ca2afcdd895677c5c3ff16a83af372c7b7)
diff --git a/gui/theme/common/languages/en.xml b/gui/theme/common/languages/en.xml
index 3769da5..ac9472e 100755
--- a/gui/theme/common/languages/en.xml
+++ b/gui/theme/common/languages/en.xml
@@ -722,5 +722,7 @@
 		<string name="unmount_sys_install">Unmount System before installing a ZIP</string>
 		<string name="unmount_system">Unmounting System...</string>
 		<string name="unmount_system_err">Failed unmounting System</string>
+		<string name="flash_ab_inactive">Flashing A/B zip to inactive slot: {1}</string>
+		<string name="flash_ab_reboot">To flash additional zips, please reboot recovery to switch to the updated slot.</string>
 	</resources>
 </language>