[FIX] website, *: add missing _lt and missing .pot entries

There were 2 errors fixed by this commit:
1. The form registry fields added in [1] and [2] in Odoo 13 had a
   `string` attribute translated with `_t()` while now it should be
   translated with `_lt()`. It was surely working in Odoo 13 but not
   anymore. It's not worth investigating to be sure.
2. The IMP done at [3] added a lot of fields but all of those forgot the
   `_t()`/`_lt()` translation.

Note that:
1. A fix to replace `_t` by `_lt` was done at [4] but it was badly done
   as it was not targetting the correct version... and only fixed one of
   many occurences.

[1]: https://github.com/odoo/odoo/pull/32565
[2]: https://github.com/odoo/enterprise/pull/4063
[3]: https://github.com/odoo/odoo/commit/617eba941785aa680edb826e14b0009637d60dee
[4]: https://github.com/odoo/odoo/commit/2be83cae7bcda369ed5bc7806aef845c6c76e687



opw-3471873

closes odoo/odoo#133692

Related: odoo/enterprise#46590
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>
Signed-off-by: Romain Derie (rde) <rde@odoo.com>