added dynamic user preferences #7 #9 (#90)

- fixed user settings database #9
- added dynamic user preferences #9
- added form to edit user preferences #9
- removed user language #7

templates/sidebar/settings.html.twig

@@ -9,3 +9,9 @@
         </select>
     </label>
 </div>
+{#
+{{ form_start(form) }}
+{{ form_widget(form) }}
+<input type="submit" value="{{ 'action.save'|trans }}" class="btn btn-primary" />
+{{ form_end(form) }}
+#}