md settings: Change action link to button on lock screen.

chrome/app/settings_strings.grdp

Index: chrome/app/settings_strings.grdp
diff --git a/chrome/app/settings_strings.grdp b/chrome/app/settings_strings.grdp
index 39b7e244203bf5cb6ffc7c7b3c82227f3522797b..5ffaf1b51c852968e996b2929a3747b29d3f415f 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -2274,6 +2274,12 @@
     <message name="IDS_SETTINGS_PEOPLE_ENABLE_SCREENLOCK" desc="The text on the checkbox to enable screenlocker for current user.">
       Show lock screen when waking from sleep
     </message>
+    <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_HIGH_SECURITY" desc="Text on the lock screen which indicates an unlock method is high security.">
+      High security
+    </message>
+    <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_MEDIUM_SECURITY" desc="Text on the lock screen which indicates an unlock method is medium security.">
+      Medium security
+    </message>
     <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_TITLE" desc="Text on the people page which opens up the quick unlock subpage and the title of the quick unlock subpage.">
       Screen lock
     </message>