Code Quality: Rename string to "Background Color"

Author: yaira2

src/Files.App/Strings/en-US/Resources.resw

@@ -216,8 +216,8 @@
   <data name="Appearance" xml:space="preserve">
     <value>Appearance</value>
   </data>
-  <data name="Background" xml:space="preserve">
-    <value>Background</value>
+  <data name="BackgroundColor" xml:space="preserve">
+    <value>Background color</value>
   </data>
   <data name="Advanced" xml:space="preserve">
     <value>Advanced</value>

src/Files.App/Views/Settings/AppearancePage.xaml

@@ -129,13 +129,13 @@
 
 			<!--  App Background  -->
 			<local:SettingsBlockControl
-				Title="{helpers:ResourceString Name=Background}"
+				Title="{helpers:ResourceString Name=BackgroundColor}"
 				HorizontalAlignment="Stretch"
 				IsExpanded="True">
 				<local:SettingsBlockControl.Icon>
 					<FontIcon Glyph="&#xE771;" />
 				</local:SettingsBlockControl.Icon>
-				<Button Padding="0" AutomationProperties.Name="{helpers:ResourceString Name=Background}">
+				<Button Padding="0" AutomationProperties.Name="{helpers:ResourceString Name=BackgroundColor}">
 					<StackPanel Orientation="Horizontal">
 						<Border
 							Width="24"