Fixed references to old string, now removed

res/layout-v14/generic_explanation.xml

@@ -30,7 +30,7 @@
 		android:layout_weight="2"
 	    android:padding="10dip"
 	    android:scrollbarAlwaysDrawVerticalTrack="true"
-		android:text="@string/text_placeholder" 
+		android:text="@string/placeholder_sentence" 
 		/>
     
 	<ListView 

res/layout/fragment_changelog.xml

@@ -30,7 +30,7 @@
 		android:layout_weight="2"
 	    android:padding="10dip"
 	    android:scrollbarAlwaysDrawVerticalTrack="true"
-		android:text="@string/text_placeholder"
+		android:text="@string/placeholder_sentence"
 		android:autoLink="all"
 		/>
     

res/layout/generic_explanation.xml

@@ -30,7 +30,7 @@
 		android:layout_weight="2"
 	    android:padding="10dip"
 	    android:scrollbarAlwaysDrawVerticalTrack="true"
-		android:text="@string/text_placeholder" 
+		android:text="@string/placeholder_sentence" 
 		/>
     
 	<ListView