Replace Russian functional strings baked into the locale-independent
index.js/test.js (and their references across ru/en/es docs and the
legacy description.es.yml) with language-neutral English so en/es
learners no longer see/print Russian:
- instructions: order-status output strings
- syntax-errors: success message
- comments: TODO marker; test internal comment

Illustrative README-only comments translated per locale. vitest green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…test

The test reads the source via node:fs but tsconfig sets types: [] (no
Node typings), so tsc --build failed (TS2591). Switch to @ts-nocheck
matching the 350-type-annotations pattern, and wrap the long
readFileSync call to satisfy the biome formatter.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy consolidated description.es.yml for all 7 lessons (basic,
operator, commutativity, composition, priority, float, linting) after
the ru theory rewrite. Code/output left intact; MDN/Wikipedia tip links
localized per locale.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for all 4 lessons (quotes, escape-characters,
string-concatenation, encoding) after the ru theory rewrite.

escape-characters: the Russian demo string baked into index.js/test.js
is replaced with a language-neutral English one, synced across ru/en/es
docs so the shared exercise no longer requires printing Russian. vitest green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for all 8 lessons (definition, change,
variables-naming, variables-expressions, variable-concatenation,
naming-style, magic-numbers, constants) after the ru theory rewrite.
This also resolves the Cyrillic-c typo in variables-naming Self-check.

Russian functional strings baked into shared index.js/test.js are
neutralized to English (change: in transit/delivered; concatenation:
Anna/Hello/order strings; magic-numbers: Boxes in stock), synced across
ru/en/es docs. vitest 8/8 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for the two rewritten lessons
(primitive-data-types, data-types-weak-typing).

45-undefined/test.js: guard firstCall with optional chaining to clear
the TS18048 build error and neutralize its Russian internal comment.
vitest 5/5 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for the 4 rewritten lessons (call,
calling-functions-expression, variadic-parameters, deterministic).

135-default-params/index.js: Russian inline comments neutralized to
English in the shared exercise template. vitest 5/5 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for bool-type, logical-operators and
logical-negation after the ru theory rewrite.

17-bool-strings: the lesson previously had only the ru locale; create
en/, es/ and the legacy description.es.yml from the ru source. vitest 6/6 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for all 4 lessons (if, if-else, else-if,
ternary-operator) after the ru theory rewrite. vitest 5/5 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Re-translate README/EXERCISE/data.yml for en and es and rebuild the
legacy description.es.yml for the 6 rewritten lessons (while,
aggregation-numbers, aggregation-strings, iteration-over-string,
return-from-loops, for) after the ru theory rewrite.

iteration-over-string/index.js: Russian biome-ignore comment neutralized
to English. vitest 10/10 green.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

…log)

Lessons outside the en/es resync backlog still carried Russian baked into
the locale-independent index.js/test.js. Replace with language-neutral
English, synced across ru/en/es docs:

- 31-advanced-strings/25-interpolation: greeting/order output string
- 31-advanced-strings/90-multiline-strings: email body (es exercise gains
  the expected-output block it was missing)
- 40-define-functions/150-return: truncate test inputs
- 40-define-functions/350-type-annotations: @ts-nocheck note and the
  JSDoc assertion messages

vitest 11/11 green across both modules.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>