Add reviewers as contributors.

[niccokunzmann]

Currently, we only count translations as contributions. People who review should be counted as well.

[niccokunzmann]

Currently, we can not get the reviewers.

Example reviewed translation:

    {
        "comment": "", 
        "key": "I’m a warrior of the now.", 
        "tags": null, 
        "string_hash": "6b2b81be9c8cee589e1365327e4fb79d", 
        "character_limit": null, 
        "reviewed": true, 
        "user": "niccokunzmann", 
        "context": "", 
        "source_string": "I’m a warrior of the now.", 
        "translation": "Ich bin von nun an ein Krieger.", 
        "last_update": "2018-12-24T20:53:43.894", 
        "pluralized": false, 
        "occurrences": null
    }, 

Using statistics:

curl -i -L --user api:$TRANSIFEX_PASSWORD -X GET 'https://api.transifex.com/organizations/12-characters/reports/activity/?project_slug=12-characters-play&resource_slug=01-lets-party-like-its-2099-txt'
HTTP/1.1 403 Forbidden
Server: nginx
Date: Fri, 18 Jan 2019 20:01:18 GMT
Content-Type: application/json
Content-Length: 143
Connection: keep-alive
Allow: GET, HEAD, OPTIONS
X-Transifex-User: niccokunzmann
X-Transifex-Project: 
X-Transifex-Organization: 12-characters
X-Transifex-View: ReportView:get

{"detail":"Your plan does not support advanced API features. Please contact the organization administrators.","error_code":"permission_denied"}