v12.7.1

• sync: folders that are not languages are no longer created as languages. When
  the language folders are discovered from the path (the default
  {{language}}/{{namespace}} layout without --language/--languages), a
  folder now counts as a language only if its name looks like a language tag
  and either its base subtag is a known language code or it holds a file with
  the same name as a known language folder, so custom codes next to the usual
  en/translation.json keep working. Running locize sync from a repository
  root used to create .git, src or node_modules as languages in the
  project; such folders are now skipped with a warning naming them, and
  --languages still forces any folder through.