Add TWRP app install via TWRP recovery

Note: I will have to add a build flag for excluding the app later for
watches and maybe Android TV. I will also have to add support in the
tablet and watch layouts later. I will merge this for the initial roll out
to select devices and finish up later.

Change-Id: Ia4ce5522fae542afa1539b10c0691315392a19ab
diff --git a/gui/theme/common/languages/en.xml b/gui/theme/common/languages/en.xml
index 7716418..d911312 100644
--- a/gui/theme/common/languages/en.xml
+++ b/gui/theme/common/languages/en.xml
@@ -114,6 +114,13 @@
 		<string name="rebooting">Rebooting...</string>
 		<string name="swipe_reboot">Swipe to Reboot</string>
 		<string name="swipe_reboot_s">   Reboot</string>
+		<string name="reboot_install_app_hdr">Install TWRP App?</string>
+		<string name="reboot_install_app1">Would you like to install the Official TWRP App?</string>
+		<string name="reboot_install_app2">The app can check for new TWRP versions.</string>
+		<string name="reboot_install_app_prompt_install">Prompt to install TWRP app if not installed</string>
+		<string name="reboot_install_app_system">Install as a System App</string>
+		<string name="reboot_installing_app">Installing App...</string>
+		<string name="swipe_to_install_app">Swipe to Install TWRP App</string>
 		<string name="swipe_flash">Swipe to confirm Flash</string>
 		<string name="confirm_action">Confirm Action</string>
 		<string name="back_cancel">Press back button to cancel.</string>