Enter prosodic system in expressions
It should be possible to enter prosodic system by the controlled vocabulary as presented in the Wiki. On the entry page and the search facette for expressions, a dropdown list titled 'Prosodic system' should display the name of the bahir on the top level (similar to vocal and instrumental music under genre), and the label of the vezin (Hezec 1, Hezec 2, etc.) with the responding feet alignments (similar to specific musical genres under vocal and instrumental music). It should be possible to filter the results by usul, as it is the case with expressions currently.