Impacted versions:
master

Steps to reproduce:
On the video

Current behavior:
You have to write the name of the group only

Expected behavior:
Either Writing the code or the name of an Account Group fetch the record 

Video/Screenshot link (optional):
https://drive.google.com/file/d/0B1w9gokcJL9hVWpaMTdGQ3RlLTQ/view

addons/account/models/account.py
tag_ids = fields.Many2many('account.account.tag', 'account_tax_account_tag', string='Tags', help="Optional tags you may want to assign for custom reporting")
    tax_group_id = fields.Many2one('account.tax.group', string="Tax Group", default=_default_tax_group, required=True)
    use_cash_basis = fields.Boolean(
        'Use Cash Basis',
        help="Select this if the tax should use cash basis,"
        "which will create an entry for this tax on a given account during reconciliation")
    cash_basis_account = fields.Many2one(
        'account.account',
        string='Tax Received Account',
        domain=[('deprecated', '=', False)],
        help='Account use when creating entry for tax cash basis')
    _sql_constraints = [
        ('name_company_uniq', 'unique(name, company_id, type_tax_use)', 'Tax names must be unique !'),
    ]
    @api.multi
    def unlink(self):
        company_id = self.env.user.company_id.id
        ir_values = self.env['ir.values']
        supplier_taxes_id = set(ir_values.get_default('product.template', 'supplier_taxes_id', company_id=company_id) or [])
        deleted_sup_tax = self.filtered(lambda tax: tax.id in supplier_taxes_id)
        if deleted_sup_tax:
            ir_values.sudo().set_default('product.template', "supplier_taxes_id", list(supplier_taxes_id - set(deleted_sup_tax.ids)), for_all_users=True, company_id=company_id)
        taxes_id = set(self.env['ir.values'].get_default('product.template', 'taxes_id', company_id=company_id) or [])
        deleted_tax = self.filtered(lambda tax: tax.id in taxes_id)
        if deleted_tax:
            ir_values.sudo().set_default('product.template', "taxes_id", list(taxes_id - set(deleted_tax.ids)), for_all_users=True, company_id=company_id)
        return super(AccountTax, self).unlink()
    @api.one
    @api.constrains('children_tax_ids', 'type_tax_use')
    def _check_children_scope(self):