SystemUI: Remove unused strings

Change-Id: Ie8bf95abfeb4c13b30e9949aa9676ab39920bf29
core: Fix AOSP EL translation

* 'Minutes' was the same in singular & plural forms, fix that

Change-Id: I8444d879fa38fdbb9a89b96ff983c135cd0f3499
Merge remote-tracking branch 'cm/cm-11.0' into cm-11.0