Add row spacing string

src/main/res/values/strings.xml

@@ -664,6 +664,7 @@ File %1$s contained %2$s.\n\n
     <string name="synchronization">Synchronization</string>
     <string name="enabled">Enabled</string>
     <string name="font_size">Font size</string>
+  <string name="row_spacing">Row spacing</string>
     <string name="customize_edit_screen">Customize edit screen</string>
     <string name="source_code">Source code</string>
     <string name="translations">Contribute translations</string>

src/main/res/xml/preferences_appearance.xml

@@ -16,7 +16,7 @@
         <Preference
             android:defaultValue="16"
             android:key="@string/p_rowPadding"
-            android:title="Row spacing" />
+            android:title="@string/row_spacing" />
 
         <com.todoroo.astrid.ui.MultilineCheckboxPreference
             android:defaultValue="false"