We are still sending too much information per /Course request

[Haeri]

A single course request still responds with too much data:

{
    "id": "95d455b4-97a1-4a71-b637-0c58957a09f3",
    "title": "Informatics 2",
    "description": "Algodat + Modelling",
    "owner": "dr.prof@uzh.ch",
    "startDate": "2019-09-22T00:00:00.000+0000",
    "endDate": "2020-01-01T00:00:00.000+0000",
    "assignments": [
        {
            "id": "9a6515d9-244c-4d5e-a3fe-cc829fae1154",
            "title": "assignment1",
            "description": "string manipulation lab",
            "publishDate": "2001-12-15T00:00:00.000+0000",
            "dueDate": "2001-05-11T00:00:00.000+0000",
            "exercises": [
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                    "language": "python"
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                {
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                    "type": "text",
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                },
                {
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                    "type": "multipleChoice",
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                }
            ]
        },
        {
            "id": "461da5a6-56b5-40b0-a13c-cb01efeec69c",
            "title": "assignment2",
            "description": "Inheritance, I think?",
            "publishDate": "2001-12-22T00:00:00.000+0000",
            "dueDate": "2001-12-25T00:00:00.000+0000",
            "exercises": [
                {
                    "id": "020e1173-f1e6-4f03-afbe-854f6e7394f0",
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                    "language": "python"
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    ]
}