Simplify tgColorizeTags directive.

app/coffee/modules/common/tags.coffee

@@ -21,6 +21,7 @@
 
 taiga = @.taiga
 trim = @.taiga.trim
+bindOnce = @.taiga.bindOnce
 
 module = angular.module("taigaCommon")
 
@@ -68,23 +69,19 @@ ColorizeTagsDirective = ->
         <% }) %>
         """)
     }
+
     link = ($scope, $el, $attrs, $ctrl) ->
         render = (srcTags) ->
             template = templates[$attrs.tgColorizeTagsType]
-            tags = []
-            for tag in srcTags
+            tags = _.map srcTags, (tag) ->
                 color = $scope.project.tags_colors[tag]
-                tags.push({name: tag, color: color})
-            $el.html template({tags: tags})
+                return {name: tag, color: color}
 
-        $scope.$watch $attrs.tgColorizeTags, ->
-            tags = $scope.$eval($attrs.tgColorizeTags)
-            if tags?
-                render(tags)
+            html = template({tags: tags})
+            $el.html(html)
 
-        tags = $scope.$eval($attrs.tgColorizeTags)
-        if tags?
-            render(tags)
+        $scope.$watch $attrs.tgColorizeTags, (tags) ->
+            render(tags) if tags?
 
     return {link: link}