close lightbox if the user press the browswer back button

app/coffee/app.coffee

@@ -690,7 +690,7 @@ i18nInit = (lang, $translate) ->
 
 
 init = ($log, $rootscope, $auth, $events, $analytics, $translate, $location, $navUrls, appMetaService,
-        loaderService, navigationBarService, errorHandlingService) ->
+        loaderService, navigationBarService, errorHandlingService, lightboxService) ->
     $log.debug("Initialize application")
 
     $rootscope.$on '$translatePartialLoaderStructureChanged', () ->
@@ -737,6 +737,11 @@ init = ($log, $rootscope, $auth, $events, $analytics, $translate, $location, $na
     $rootscope.$on '$locationChangeStart',  (event) ->
         errorHandlingService.init()
 
+        if lightboxService.getLightboxOpen().length
+            event.preventDefault();
+
+            lightboxService.closeAll()
+
     # On the first page load the loader is painted in `$routeChangeSuccess`
     # because we need to hide the tg-navigation-bar.
     # In the other cases the loader is in `$routeChangeSuccess`
@@ -861,5 +866,6 @@ module.run([
     "tgLoader",
     "tgNavigationBarService",
     "tgErrorHandlingService",
+    "lightboxService",
     init
 ])

app/coffee/modules/common/lightboxes.coffee

@@ -97,6 +97,10 @@ class LightboxService extends taiga.Service
                 scope.$destroy() if scope
                 $el.remove()
 
+
+    getLightboxOpen: ->
+        return $(".lightbox.open")
+
     closeAll: ->
         docEl = angular.element(document)
         for lightboxEl in docEl.find(".lightbox.open")