Add Bulgarian to Tails website weblate
The Bulgarian translators have translated the Tails GUI and want to translate Tails website, but it seems Bulgarian is not enabled on https://translate.tails.net/. Could we add it? cc @zen ## To do From [Enable a new language in Weblate](https://tails.net/contribute/working_together/roles/translation_platform/operations/#index1h1): - [x] exclude the new language in the production website: [tails!1997](https://gitlab.tails.boum.org/tails/tails/-/merge_requests/1997) - [x] add the new language to `$weblate_additional_languages` - [x] add `.po` files to Git - [x] update Weblate components - [x] make sure the new `.po` files land in `tails.git`'s `master` branch - [x] fix doc to add [the manual push to canonical](https://gitlab.torproject.org/tpo/tpa/tails-sysadmin/-/issues/18194#note_3170142) - [ ] add reviewers
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