Corregir popovers y dropdowns en el tab archivos

 - Se corrige el posicionamiento de los popovers.

 - Se mejora la accesibilidad.

 - Se corrige los dropdowns que estaban mostrando items de otra opción.

Frontend Angular 4/src/app/layout/archivos/archivos.component.html

@@ -29,59 +29,59 @@
             <div class="card">
               <div class="matefun-tab-options">
                 <button
-                  ngbPopover="{{ 'i18n.action.new' | translate | titleCase }}"
+                  ngbPopover="{{
+                    'i18n.action.goBack' | translate | titleCase
+                  }}"
                   triggers="mouseenter:mouseleave"
-                  data-placement="bottom"
-                  type="button"
+                  placement="bottom"
                   class="btn btn-sm btn-secondary"
-                  data-toggle="dropdown"
-                  aria-haspopup="true"
-                  aria-expanded="false"
+                  (click)="navBack()"
+                  *ngIf="directorioActual.padreId != -1"
                 >
-                  <i class="fa fa-plus"></i>
+                  <i aria-hidden="true" class="fa fa-arrow-up"></i>
                 </button>
                 <div class="dropdown-menu">
-                  <a class="dropdown-item" (click)="mkFile(true)">
-                    {{ "i18n.object.file" | translate | titleCase }}
+                  <a class="dropdown-item" (click)="ordenarPorTipo()">
+                    {{ "i18n.msg.order.kind" | translate }}
                   </a>
-                  <div class="dropdown-divider"></div>
-                  <a class="dropdown-item" (click)="mkFile(false)">
-                    {{ "i18n.object.folder" | translate | titleCase }}
+                  <div role="separator" class="dropdown-divider"></div>
+                  <a class="dropdown-item" (click)="ordenarPorFecha()">
+                    {{ "i18n.msg.order.date" | translate }}
                   </a>
                 </div>
 
                 <button
-                  ngbPopover="{{
-                    'i18n.action.goBack' | translate | titleCase
-                  }}"
+                  ngbPopover="{{ 'i18n.action.new' | translate | titleCase }}"
                   triggers="mouseenter:mouseleave"
-                  data-placement="bottom"
+                  placement="bottom"
+                  type="button"
                   class="btn btn-sm btn-secondary"
-                  (click)="navBack()"
-                  *ngIf="directorioActual.padreId != -1"
+                  data-toggle="dropdown"
+                  aria-haspopup="true"
+                  aria-expanded="false"
                 >
-                  <i aria-hidden="true" class="fa fa-arrow-up"></i>
+                  <i aria-hidden="true" class="fa fa-plus"></i>
                 </button>
 
                 <button
                   ngbPopover="{{ 'i18n.action.order' | translate | titleCase }}"
                   triggers="mouseenter:mouseleave"
-                  data-placement="bottom"
+                  placement="bottom"
                   type="button"
                   class="btn btn-sm btn-secondary"
                   data-toggle="dropdown"
                   aria-haspopup="true"
                   aria-expanded="false"
                 >
-                  <i class="fa fa-sort"></i>
+                  <i aria-hidden="true" class="fa fa-sort"></i>
                 </button>
                 <div class="dropdown-menu">
-                  <a class="dropdown-item" (click)="ordenarPorTipo()">
-                    {{ "i18n.msg.order.kind" | translate }}
+                  <a class="dropdown-item" (click)="mkFile(true)">
+                    {{ "i18n.object.file" | translate | titleCase }}
                   </a>
-                  <div class="dropdown-divider"></div>
-                  <a class="dropdown-item" (click)="ordenarPorFecha()">
-                    {{ "i18n.msg.order.date" | translate }}
+                  <div role="separator" class="dropdown-divider"></div>
+                  <a class="dropdown-item" (click)="mkFile(false)">
+                    {{ "i18n.object.folder" | translate | titleCase }}
                   </a>
                 </div>
               </div>
@@ -130,7 +130,7 @@
                 <button
                   ngbPopover="{{ 'i18n.action.order' | translate | titleCase }}"
                   triggers="mouseenter:mouseleave"
-                  data-placement="bottom"
+                  placement="bottom"
                   type="button"
                   class="btn btn-sm btn-secondary"
                   data-toggle="dropdown"
@@ -194,7 +194,7 @@
             ngbPopover="{{ 'i18n.action.load' | translate | titleCase }}/{{
               'i18n.action.edit' | translate | titleCase
             }}"
-            data-placement="bottom"
+            placement="bottom"
             triggers="mouseenter:mouseleave"
             class="btn btn-sm btn-secondary pull-left mr-2"
             (click)="cargarArchivo()"
@@ -203,7 +203,7 @@
           </button>
           <button
             ngbPopover="{{ 'i18n.action.delete' | translate | titleCase }}"
-            data-placement="bottom"
+            placement="bottom"
             triggers="mouseenter:mouseleave"
             class="btn btn-sm btn-secondary pull-left mr-2"
             (click)="mostrarEliminarDialogo()"
@@ -214,7 +214,7 @@
             ngbPopover="{{ 'i18n.action.move' | translate | titleCase }} {{
               'i18n.object.file' | translate | titleCase
             }}"
-            data-placement="bottom"
+            placement="bottom"
             triggers="mouseenter:mouseleave"
             class="btn btn-sm btn-secondary pull-left mr-2"
             (click)="seleccionarDirectorioAMover()"