'Return the translation of fields help in the context\'s language.
Note that the result contains the available translations only.
:param model_name: the name of a model
:return: the model\'s fields\' help as a dictionary `{field_name: field_help}`'

@api.model
@tools.ormcache_context('model_name', keys=('lang',))
def get_field_help(self, model_name):

    fields = self.env['ir.model.fields'].search([('model', '=', model_name)])
    return {field.name: field.help for field in fields}
