Fix api/v1/projects?languages=X query which failed with DB error

[bpfoley]

No description provided.

[bpfoley]

Reproducer to find a project with English as the primary language. Fails without this patch

  #!/bin/bash
  set -euxo pipefail

  API_KEY=bfoley
  ROOT=https://www.pgdp.org/~bfoley/c.branch/api-languages-fix

  curl -X GET "$ROOT/api/v1/projects?per_page=1&languages=English+with" \
      -H "Accept: application/json" \
      -H "X-API-KEY: $API_KEY"

[cpeel]

It took me way to long to spot the difference here, this might be more straightforward:

// The API exposes "languages" but the table column is "language" and
// are stored as "Lang1" or "Lang1 with Lang2".
// See Project.inc:encode_languages
if ($field == "languages") {
    $column_name = "language";
}