Issue #3595227: Add French as a switchable language to the Tugboat demo

Frank Mablyrequested to merge
issue/pdv-3595227:3595227-tugboat-demo-add into 1.x

Adds French as a second, switchable language to the Tugboat demo so the pdv UI can be reviewed in French.

  • Installs language + locale and adds French; English stays the site default.
  • Imports the bundled fr.po of each enabled pdv module directly via Gettext::fileToDatabase (the on-install auto-import is a batch, which does not run under drush php:script).
  • Adds a language switcher block (Olivero secondary menu) to flip the UI to French on demand.

Verified against a full standard-profile seed: English stays default, the pdv strings resolve in French, and the switcher renders working EN/FR links.

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