CrOS - Improve login error message

Make the error message on the login screen more generic. Change the
subject of the message from 'password' to 'PIN or password' to be
reused for the upcoming PIN auto submit feature.

UX Writer Document:
http://doc/1dyo1BsQ3o7IyDFGvEgWqH1wiZJlEeUuny1G9IQk2r6M

Bug: 663982
Change-Id: Idf8f0363b10a9982bdaec42a345a010bf0388e8d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339358Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Commit-Queue: Roman Sorokin [CET] <rsorokin@chromium.org>
Auto-Submit: Renato Silva <rrsilva@google.com>
Cr-Commit-Position: refs/heads/master@{#795838}

ash/ash_strings.grd

@@ -1929,10 +1929,10 @@ This file contains the strings for ash.
         Tap your profile image
       </message>
       <message name="IDS_ASH_LOGIN_ERROR_AUTHENTICATING" desc="Couldn't sign in because password is invalid">
-        Sorry, your password couldn't be verified. Please try again.
+        Your PIN or password couldn't be verified. Try again.
       </message>
       <message name="IDS_ASH_LOGIN_ERROR_AUTHENTICATING_2ND_TIME" desc="Couldn't sign in because password is invalid for the 2nd time">
-        Sorry, your password still couldn't be verified. Note: if you changed your password recently, your new password will be applied once you sign out, please use the old password here.
+        Your PIN or password still couldn't be verified. Note: If you recently changed your password, use your old password. Your new password will be applied once you sign out.
       </message>
       <message name="IDS_ASH_LOGIN_ERROR_CAPS_LOCK_HINT" desc="A hint text for the login and lock screens that Caps Lock is on">
         Caps Lock is on.

ash/ash_strings_grd/IDS_ASH_LOGIN_ERROR_AUTHENTICATING.png.sha1

+135a9324e9e8cbb6b33f56cf7a032a3aa0f6fd92
\ No newline at end of file

ash/ash_strings_grd/IDS_ASH_LOGIN_ERROR_AUTHENTICATING_2ND_TIME.png.sha1

+7fd4208d93ca3e4437d697aeace486cb17ded207
\ No newline at end of file