Fix show/hide buttons on backlog options

app/coffee/modules/backlog/main.coffee

@@ -705,12 +705,12 @@ BacklogDirective = ($repo, $rootscope, $translate) ->
             elm.addClass("active")
 
             text = $translate.instant("BACKLOG.TAGS.HIDE")
-            elm.find(".text").text(text)
+            elm.text(text)
         else
             elm.removeClass("active")
 
             text = $translate.instant("BACKLOG.TAGS.SHOW")
-            elm.find(".text").text(text)
+            elm.text(text)
 
     showHideFilter = ($scope, $el, $ctrl) ->
         sidebar = $el.find("sidebar.filters-bar")

app/partials/backlog/backlog.jade

@@ -32,12 +32,14 @@ div.wrapper(tg-backlog, ng-controller="BacklogController as ctrl",
                     span.icon.icon-move
                     span.text(translate="BACKLOG.MOVE_US_TO_CURRENT_SPRINT")
                 a.trans-button(
+                    ng-if="userstories.length"
                     href=""
                     title="{{'BACKLOG.FILTERS.TOGGLE' | translate}}"
                     id="show-filters-button"
                     translate="BACKLOG.FILTERS.SHOW"
                 )
                 a.trans-button(
+                    ng-if="userstories.length"
                     href=""
                     title="{{'BACKLOG.TAGS.TOGGLE' | translate}}"
                     id="show-tags"