Use t_ for translations in channel routes

refs #5091

- rkw is something I made up on the spot
- t_ looks like a translation function, which is what this IS!

core/server/controllers/channels/config.channels.json

@@ -4,7 +4,7 @@
         "frontPageTemplate": "home"
     },
     "tag": {
-        "route": "/:rkw-tag/:slug/",
+        "route": "/:t_tag/:slug/",
         "postOptions": {
             "filter": "tags:'%s'+tags.visibility:public"
         },
@@ -22,7 +22,7 @@
         "editRedirect": "#/settings/tags/:slug/"
     },
     "author": {
-        "route": "/:rkw-author/:slug/",
+        "route": "/:t_author/:slug/",
         "postOptions": {
             "filter": "author:'%s'"
         },

core/server/controllers/channels/router.js

@@ -96,7 +96,7 @@ channelsRouter = function router() {
     var channelsRouter = express.Router({mergeParams: true});
 
     _.each(channelLoader.list(), function (channel) {
-        var channelRoute = channel.route.replace(/:rkw-([a-zA-Z]+)/, function (fullMatch, keyword) {
+        var channelRoute = channel.route.replace(/:t_([a-zA-Z]+)/, function (fullMatch, keyword) {
             return config.get('routeKeywords')[keyword];
         });