Use bootstrap-select selector when it is necessary

tfjm/templates/base.html

@@ -263,6 +263,7 @@
                     .then(resp => resp.text())
                     .then(resp => new DOMParser().parseFromString(resp, 'text/html'))
                     .then(res => modalBody.innerHTML = res.getElementById(content_id).outerHTML)
+                    .then(() => $('.selectpicker').selectpicker())  // TODO Update that when the library will be JQuery-free
             }
         })
     }