Add label on drop-down menu for species in computer vision training model to give quick overview

As mentioned on the original thread about labelling the CV included species :

It would be nice to have the CV symbols on the drop-down menu as well at some point, for a quick overview of what is or is not included across a whole group. In more speciose genera it will be time-consuming to figure out what is or is not included without this, so a useful addition potentially.

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Note : inclusion of the symbols on the taxonomic tree was also mentioned on the blog post by @gancw1