Fix duplicates in appstream file

data/com.github.ADBeveridge.Raider.metainfo.xml

@@ -14,13 +14,11 @@
     <kudo>ModernToolkit</kudo>
     <kudo>HiDpiIcon</kudo>
   </kudos>
-  <content_rating type="oars-1.1"/>
   <launchable type="desktop-id">com.github.ADBeveridge.Raider.desktop</launchable>
   <url type="homepage">https://github.com/ADBeveridge/raider</url>
   <url type="translate">https://github.com/ADBeveridge/raider/tree/develop/po</url>
   <update_contact>[email protected]</update_contact>
   <developer_name>Alan Beveridge</developer_name>
-  <translation type="gettext">raider</translation>
   <requires>
     <display_length compare="ge">small</display_length>
   </requires>