Ok, so you must do what I wrote in my first post.
You can also use join
node like this:
[{"id":"a05cd8aa.364e68","type":"ui_template","z":"e9bac780.ed1af8","group":"f9739ca5.a36ef","name":"","order":0,"width":0,"height":0,"format":"<button class=\"inner\" id=\"mBtn1\" ng-click=\"send({archive: '10'})\">button1</button>\n<button class=\"inner\" id=\"mBtn2\" ng-click=\"send({cookies: 1})\">button2</button>","storeOutMessages":true,"fwdInMessages":true,"templateScope":"local","x":680,"y":140,"wires":[["448460c7.88a028"]]},{"id":"448460c7.88a028","type":"join","z":"e9bac780.ed1af8","name":"","mode":"custom","build":"merged","property":"","propertyType":"full","key":"topic","joiner":"\\n","joinerType":"str","accumulate":true,"timeout":"","count":"1","x":890,"y":140,"wires":[["ddd3646.1d1d418"]]},{"id":"ddd3646.1d1d418","type":"debug","z":"e9bac780.ed1af8","name":"","active":true,"console":"false","complete":"false","x":1100,"y":140,"wires":[]},{"id":"f9739ca5.a36ef","type":"ui_group","z":"","name":"Pogoda","tab":"8e345031.920048","order":2,"disp":true,"width":"6"},{"id":"8e345031.920048","type":"ui_tab","z":"","name":"test","icon":"dashboard","order":1}]