LoadingDialog: Use generic prefix for resource values.

app/src/main/res/layout/loading_dialog.xml

@@ -3,17 +3,17 @@
               android:orientation="vertical"
               android:layout_width="match_parent"
               android:layout_height="match_parent"
-              android:padding="@dimen/loading_dialog_padding">
+              android:padding="@dimen/dialog_padding">
 
-    <ProgressBar android:layout_width="@dimen/loading_dialog_progress"
-                 android:layout_height="@dimen/loading_dialog_progress"
+    <ProgressBar android:layout_width="@dimen/progress_dialog_progress_size"
+                 android:layout_height="@dimen/progress_dialog_progress_size"
                  android:layout_gravity="center"
                  android:indeterminate="true"/>
 
     <TextView android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:layout_gravity="center"
-              android:layout_marginTop="@dimen/loading_dialog_text_margin"
+              android:layout_marginTop="@dimen/progress_dialog_text_margin"
               android:text="@string/loading_dialog_loading"/>
 
 </LinearLayout>
\ No newline at end of file

app/src/main/res/values/dimensions.xml

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <dimen name="activity_padding">24dp</dimen>
+    <dimen name="dialog_padding">24dp</dimen>
 
     <dimen name="logo_margin_bottom">24dp</dimen>
     <dimen name="main_label_margin">32dp</dimen>
@@ -13,9 +14,8 @@
     <dimen name="app_list_item_padding">16dp</dimen>
     <dimen name="app_detail_description_margin">16dp</dimen>
 
-    <dimen name="loading_dialog_padding">24dp</dimen>
-    <dimen name="loading_dialog_progress">48dp</dimen>
-    <dimen name="loading_dialog_text_margin">16dp</dimen>
+    <dimen name="progress_dialog_progress_size">48dp</dimen>
+    <dimen name="progress_dialog_text_margin">16dp</dimen>
     
     <dimen name="default_list_item_margin_side">16dp</dimen>
     <dimen name="default_list_item_height">56dp</dimen>