[FIX] website_form_project: add missing .pot file

Somehow, there is not .pot file for this module while there is a
translated term.

A proper investigation wasn't made, but here is the history:
- The "Project" translatable term was added in JS with commit [1] in
  April 2019 as an IMP in master so there was no addition in the `.pot`
  file, as expected.
- The `.pot` file was added by a `[I18N] export saas-12.4 terms` commit
  at [2] in Augustus 2019.
- The `.pot` file was removed by a `[I18N] export 15.0 source` commit at
  [3] in September 2021.
  This was probably an error as the "Project" term from this module was
  never removed and always existed since it was added in 2019.

[1]: https://github.com/odoo/odoo/commit/6df3ba8b22ff16e9fd8ad6d87ea55e7eaf13e67b#diff-529f47293f2a178209115a2bc74ce79c5a880e58497a5e9d86ad4d7fd29676baR17
[2]: https://github.com/odoo/odoo/commit/8be6470a826fc6e467a3bef1696d236249ca29f9#diff-29cc1f256a825ea298abd8b7780984bacca6b874c5d139412fed5fb164794cd2R1
[3]: https://github.com/odoo/odoo/commit/63e6807437295519a0f4705fb88644d6d557ca3a#diff-29cc1f256a825ea298abd8b7780984bacca6b874c5d139412fed5fb164794cd2L1

Part-of: odoo/odoo#132975