Revert "Migrate OCCLUDED<->LOCKSCREEN alpha/translation"

Revert submission 25515462

Reason for revert: DroidMonitor: Potential culprit for Bug b/314180136 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:25515462

Change-Id: I9ba51a7cfcd2267d9bbbebad23948cdbe111a435