Task: Merge greetings with the users based on the language

n8n workflow:
{"meta":{"instanceId":"257476b1ef58bf3cb6a46e65fac7ee34a53a5e1a8492d5c6e4da5f87c9b82833"},"nodes":[{"id":"f7f8068b-52c9-4038-bd67-9ee50136e4fd","name":"When clicking ‘Test workflow’","type":"n8n-nodes-base.manualTrigger","position":[380,240],"parameters":{},"typeVersion":1},{"id":"860e5e46-a04d-41cb-b91a-c9f02603bcdf","name":"Sample data (name + language)","type":"n8n-nodes-base.code","position":[600,160],"parameters":{"jsCode":"return [\n  {\n    json: {\n      name: 'Stefan',\n      language: 'de',\n    }\n  },\n  {\n    json: {\n      name: 'Jim',\n      language: 'en',\n    }\n  },\n  {\n    json: {\n      name: 'Hans',\n      language: 'de',\n    }\n  }\n];"},"typeVersion":2},{"id":"5c6a867b-fd8a-49b7-ac35-ff84ed6d89f7","name":"Sample data (greeting + language)","type":"n8n-nodes-base.code","position":[600,320],"parameters":{"jsCode":"return [\n\t  {\n    json: {\n      greeting: 'Hello',\n      language: 'en',\n    }\n  },\n  {\n    json: {\n      greeting: 'Hallo',\n      language: 'de',\n    }\n  }\n];"},"typeVersion":2},{"id":"08fca489-8f4c-4327-9919-922bd1be1cd5","name":"Merge (name + language + greeting)","type":"n8n-nodes-base.merge","position":[820,240],"parameters":{"mode":"combine","options":{},"fieldsToMatchString":"language"},"typeVersion":3}],"pinData":{},"connections":{"Sample data (name + language)":{"main":[[{"node":"Merge (name + language + greeting)","type":"main","index":0}]]},"Sample data (greeting + language)":{"main":[[{"node":"Merge (name + language + greeting)","type":"main","index":1}]]},"When clicking ‘Test workflow’":{"main":[[{"node":"Sample data (name + language)","type":"main","index":0},{"node":"Sample data (greeting + language)","type":"main","index":0}]]}}}