Add placeholder and description fields to extra_field table

[ywarnier]

Current behavior / Resultado actual / Résultat actuel

There's no way to add a placeholder within an extra field or a description below an extra field.

Expected behavior / Resultado esperado / Résultat attendu

Make these available

Steps to reproduce / Pasos para reproducir / Étapes pour reproduire

Create any user extra field, then view it as the user in your profile. No placeholder nor description possibility, making it difficult to illustrate.

Chamilo Version / Versión de Chamilo / Version de Chamilo

1.11.x

[ywarnier]

The fields "description" and "helper_text" have been added to the extra_field table, but at this time only the description field appears in the extra_field form, and it is not shown in the item's edit form later on (that's fine, it's internal).

Th helper_text field is not offered at extra_field create/update, and does subsequently also not appear in other forms later on. It should appear below the field, to explain to the final user what it does.

[christianbeeznest]

Implemented helper_text support for extra fields: it is now configurable in create/update and shown below the field in user-facing forms. description remains internal.

55c1847

[ywarnier]

Works for me. Thanks!