Replace the exercise pages' Python-only snippets with source-backed implementations for the 13 visible programming languages, and localize reader-facing comments by site language. Zig remains out of scope.
Approval bypass: repository protection requires one approval but does not enforce it for administrators. All 68 completed checks succeeded; four non-required Java jobs remained queued on the existing ubuntu-20.04 workflow, with no failed checks.
Add dedicated chapter exercise sections and generated exercise pages for the English, Japanese, and Russian editions.
Add navigation for all published languages while keeping Taiwan Traditional Chinese exercise pages generated at build time.
* docs(ru): replace prose quotes with guillemets
* docs(ru): replace prose semicolons with periods
* docs(ru): align animation title forms
* docs(ru): align figure and table references
Yudong Jin