Alphabetize se:subject in metadata

src/epub/content.opf

@@ -35,8 +35,8 @@
 		<meta property="term" refines="#subject-1">sh85062975</meta>
 		<meta property="authority" refines="#subject-2">LCSH</meta>
 		<meta property="term" refines="#subject-2">Unknown</meta>
-		<meta property="se:subject">Fiction</meta>
 		<meta property="se:subject">Childrens</meta>
+		<meta property="se:subject">Fiction</meta>
 		<dc:description id="description">An eleven-year old English boy gets involved in a continuous series of amusing adventures to the exasperation of his long-suffering family.</dc:description>
 		<meta id="long-description" property="se:long-description" refines="#description">
 			&lt;p&gt;&lt;i&gt;Just William&lt;/i&gt;, published in 1922, was the first of a long series of well-loved books about William Brown, an eleven-year old English schoolboy, written by Richmal Crompton. William is continually scruffy and disreputable, and has a talent for getting into trouble and becoming involved in various inventive plots and scrapes, to the exasperation of his long-suffering parents and older siblings.&lt;/p&gt;