More layout and manifest fixes. Notably, moving most hardcoded strings to strings.xml

res/layout-port/activity_pc_view.xml

@@ -32,7 +32,7 @@
         android:layout_below="@+id/manuallyAddPc"
         android:paddingTop="10dp"
         android:paddingBottom="10dp"
-        android:text="PC List" />
+        android:text="@string/title_pc_view" />
 
     <Button
         android:id="@+id/settingsButton"
@@ -40,7 +40,7 @@
         android:layout_height="wrap_content"
         android:layout_centerHorizontal="true"
         android:layout_alignParentTop="true"
-        android:text="Streaming Settings" />
+        android:text="@string/button_stream_settings" />
     
     <Button
         android:id="@+id/manuallyAddPc"
@@ -48,6 +48,6 @@
         android:layout_height="wrap_content"
         android:layout_below="@+id/settingsButton"
         android:layout_centerHorizontal="true"
-        android:text="Add PC Manually" />
+        android:text="@string/button_add_pc_manually" />
 
 </RelativeLayout>