For -dev4.1
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<!-- strings_help.xml -->
<string name="help_hint_ignore_battery_optimizations">Android 6: For more reliable mail sync, you may want to allow AquaMail to
work in the background (ignoring \"battery optimizations\")</string>
<!-- strings_prefs.xml -->
<string name="prefs_threaded_back_to_collapse">\"Back\" to collapse </string>
<string name="prefs_threaded_back_to_collapse_summary">Pressing \"Back\" will collapse the expanded conversation (if any)</string>