Use a general message when a PIN is required after booting or after s…

…ome time

This prevents certain information from being leaked if an attacker gets
their hands on a phone.

Closes GrapheneOS/os-issue-tracker#2607

packages/SystemUI/res-keyguard/values/strings.xml

@@ -173,7 +173,7 @@
     <string name="kg_prompt_after_dpm_lock">For added security, device was locked by work policy</string>
 
     <!-- Message shown for pin/pattern/password when we are on bouncer after user triggered lockdown.  [CHAR LIMIT=70] -->
-    <string name="kg_prompt_after_user_lockdown_pin">PIN is required after lockdown</string>
+    <string name="kg_prompt_after_user_lockdown_pin">Enter your PIN</string>
 
     <!-- Message shown for pin/pattern/password when we are on bouncer after user triggered lockdown.  [CHAR LIMIT=70] -->
     <string name="kg_prompt_after_user_lockdown_password">Password is required after lockdown</string>
@@ -290,7 +290,7 @@
     <string name="kg_prompt_reason_restart_pattern">Pattern is required after device restarts</string>
 
     <!-- An explanation text that the pin needs to be entered since the device has just been restarted. [CHAR LIMIT=70] -->
-    <string name="kg_prompt_reason_restart_pin">PIN is required after device restarts</string>
+    <string name="kg_prompt_reason_restart_pin">Enter your PIN</string>
 
     <!-- An explanation text that the password needs to be entered since the device has just been restarted. [CHAR LIMIT=70] -->
     <string name="kg_prompt_reason_restart_password">Password is required after device restarts</string>