CMS: change title "How to validate?" for validated runs records

[katilp]

The CMS validated run records show "How to validate?" for the description of how data have been validated. The title gives an impression that the user should do something to validate although the description is of the work already done.

Change the title for the json field "validation" of the records of type

    "type": {
      "primary": "Environment", 
      "secondary": [
        "Validation"
      ]
    }, 

to "How the validation was done?"