feat: regex web + precision horaire + placeholder (ticket 496/497/500)

src/app/form/form.component.html

src/app/form/form.component.scss

src/app/form/form.component.ts

src/app/form/pageType.enum.ts

src/app/reset-password/reset-password.component.html

...ts/create-account-form/create-account-form.component.html

...hared/components/signup-modal/signup-modal.component.html

src/app/utils/CustomRegExp.ts