OmniGears: cleanup

-validate power menu entries with global action list
-use SeekBarPreference for ambient display brightness
-set values from PowerManager for brightness seekbars
-rework button backlight page

Change-Id: Id5375684d99942cb350d917bc45b587dd608b1c7
diff --git a/res/values/custom_strings.xml b/res/values/custom_strings.xml
index 32c28fd..5d7a224 100644
--- a/res/values/custom_strings.xml
+++ b/res/values/custom_strings.xml
@@ -179,17 +179,14 @@
     <string name="statusbar_battery_charging_color_enable_summary"></string>
     <string name="battery_enable_title">Show battery</string>
 
-    <string name="button_brightness_title">Brightness</string>
-    <string name="button_brightness_summary">Button backlight brightness</string>
+    <string name="button_backlight_title">Button backlight</string>
     <string name="button_timeout_title">Backlight timeout</string>
     <string name="button_timeout_summary">Disabled on value 0</string>
-    <string name="button_no_brightness">Dark mode</string>
-    <string name="button_no_brightness_summary">Don\'t set button brightness</string>
     <string name="button_link_brightness">Link to screen</string>
     <string name="button_link_brightness_summary">Use screen brightness level</string>
     <string name="button_manual_brightness">Brightness level</string>
-    <string name="dialog_manual_brightness_title">Brightness level</string>
     <string name="unit_sec">sec</string>
+    <string name="button_backlight_enable_title">Enable</string>
 
     <string name="navigation_bar_show_title">Show navigation bar</string>
     <string name="navigation_bar_show_summary">Force enable navigation bar</string>