Added JS to fix dropdown alignment

Closes #14386

app/assets/javascripts/dropdowns.js.coffee

+$ ->
+  $('[data-toggle="dropdown"]').each ->
+    $dropdown = $(@).parent()
+    $menu = $dropdown.find('.dropdown-menu')
+
+    $dropdown.on 'shown.bs.dropdown', ->
+      dropdownRight = $menu.offset().left + $menu.outerWidth()
+
+      if dropdownRight >= $(window).width()
+        $menu.addClass 'dropdown-menu-align-right'