linked: use webview instead of app, and some minor layoutings

OpenKeychain/src/main/res/layout/loader_layout.xml

@@ -4,7 +4,6 @@
     android:layout_height="match_parent"
     android:orientation="vertical">
 
-    <!--rebuild functionality of ListFragment -->
     <LinearLayout
         android:id="@+id/loader_progress"
         android:orientation="vertical"
@@ -14,16 +13,9 @@
 
         <ProgressBar
             style="?android:attr/progressBarStyleLarge"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content" />
-
-        <TextView
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:textAppearance="?android:attr/textAppearanceSmall"
-            android:text=""
-            android:paddingTop="4dip"
-            android:singleLine="true" />
+            android:gravity="center" />
 
     </LinearLayout>