Update manual for annotation/file label import

resources/views/manual/tutorials/volumes/file-metadata.blade.php

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 image_2.png,2016-12-19 17:09:31,52.215,28.501,-1502.5,28.25,2.1
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-            The metadata CSV file can be uploaded when a new volume is created. For existing volumes, metadata can be uploaded by volume admins on the volume edit page that you can reach with the <button class="btn btn-default btn-xs"><span class="fa fa-pencil-alt" aria-hidden="true"></span></button> button of the volume overview. This will replace any previously imported metadata.
+            The metadata CSV file can be uploaded when a new volume is created. For existing volumes, metadata can be uploaded by volume admins on the volume edit page that you can reach with the <button class="btn btn-default btn-xs"><span class="fa fa-pencil-alt" aria-hidden="true"></span></button> button of the volume overview. This will replace any previously imported metadata. Some metadata formats also contain annotations or file labels. In this case, BIIGLE will show buttons to initiate the import as well.
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