manual: Add language="vala" attribute to Devhelp version

diff --git a/doc/manual/devhelp.xsl b/doc/manual/devhelp.xsl
index 3a1db148f88f70bc1370087f19211d06e0dc48b6..92036c38a112884da61ef0967fc5449c1584b749 100644 (file)
--- a/doc/manual/devhelp.xsl
+++ b/doc/manual/devhelp.xsl
@@ -13,7 +13,7 @@
   />
 
   <xsl:template match="/">
-    <book title="{/article/section/title/text()}" link="index.html" author="" name="vala" version="2">
+    <book title="{/article/section/title/text()}" link="index.html" author="" name="vala" language="vala" version="2">
       <chapters>
         <xsl:apply-templates select="/article/section/section"/>
       </chapters>