Fix i18n for QPullToRefresh (quasarframework#1229)

Author: pdanpdan

src/components/pull-to-refresh/QPullToRefresh.js

@@ -43,12 +43,12 @@ export default {
     message () {
       switch (this.state) {
         case 'pulled':
-          return this.releaseMessage || this.$q.i18n.label.pullToRefresh.release
+          return this.releaseMessage || this.$q.i18n.pullToRefresh.release
         case 'refreshing':
-          return this.refreshMessage || this.$q.i18n.label.pullToRefresh.refresh
+          return this.refreshMessage || this.$q.i18n.pullToRefresh.refresh
         case 'pull':
         default:
-          return this.pullMessage || this.$q.i18n.label.pullToRefresh.pull
+          return this.pullMessage || this.$q.i18n.pullToRefresh.pull
       }
     },
     style () {