Show how many vocabs are in a group/package

[noctera]

Currently you can't see how many vocabs you have in one group/package. Ideally there should be a little counter in the library

Maybe add somthing like this next to the name

Currently it can only be implemented for the language package page in the library as the these information can already be sent from the server, as for the groups page some information are not sent to the client. Check vocascan/vocascan-server#92 for the current status of the backend implementation

[luwol03]

I would suggest using the Counter component, but only show the number in the circle.