md settings: Update lock screen to match new mocks.

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 a2a2861b1938d49a64f9a35f4540cbda29e51c4b..959746f6f116ff8363316fe3f2f869805fc07deb 100644
--- a/chrome/app/settings_strings.grdp
+++ b/chrome/app/settings_strings.grdp
@@ -2358,6 +2358,9 @@
     <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>
+    <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_OPTIONS" desc="Text on the lock screen which is the subheader for the screen locking options.">
+      Screen lock options
+    </message>
     <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_PASSWORD_ONLY" desc="Only the account password can be used to unlock the device.">
       Password only
     </message>
@@ -2379,6 +2382,9 @@
     <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_EDIT_FINGERPRINTS_DESCRIPTION" desc="Secondary text on the lock screen which opens up the fingerprint subpage.">
       Set up a faster way to unlock your device
     </message>
+    <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_FINGERPRINT_SETUP_BUTTON" desc="Text on the lock screen button which opens up the fingerprint subpage.">
+      Set Up

[stevenjb, 2017/05/08 18:12:21]

Elsewhere (e.g. EASY_UNLOCK_SETUP) we use "Set up" which I think is more
correct. We should be consistent regardless.

[sammiequon, 2017/05/08 19:16:48]

Done.

+    </message>
     <message name="IDS_SETTINGS_PEOPLE_LOCK_SCREEN_NUM_FINGERPRINTS" desc="Text on the lock screen which tells users how many fingerprints they have enrolled.">
       <ph name="NUM_FINGERPRINTS">$1<ex>1</ex></ph> fingerprints set up
     </message>