Set LANG=C.UTF-8 in javascript-node and typescript-node images

[Copilot]

LANG is unset in the javascript-node (and inherited typescript-node) images, breaking UTF-8 rendering in locale-aware tools — e.g. tmux display-message -p "#{client_utf8}" returns 0 and Unicode characters fail to render.

Changes

• Dockerfiles: added ENV LANG=C.UTF-8 to both src/javascript-node/.devcontainer/Dockerfile and src/typescript-node/.devcontainer/Dockerfile.

  # Set locale so Unicode characters render correctly in locale-aware tools (e.g. tmux).
  ENV LANG=C.UTF-8

• Versions (patch bump): javascript-node 4.0.13 → 4.0.14, typescript-node 5.0.1 → 5.0.2, with matching README tag examples.

• Tests: added a lang-utf8 check to each image's test-project/test.sh asserting $LANG equals C.UTF-8.

Notes

C.UTF-8 is used rather than en_US.UTF-8 because it's always present in the base image without generating a locale, sidestepping the breaking-change concern raised in nodejs/docker-node#1839.

[Copilot]

Pull request overview

Sets a default UTF-8 locale for the javascript-node image (and the derived typescript-node image) to ensure Unicode renders correctly in locale-aware tooling, and adds smoke tests + version/doc updates to validate and publish the change.

Changes:

• Add ENV LANG=C.UTF-8 to javascript-node and typescript-node Dockerfiles.
• Patch-bump image versions in each manifest.json and update README tag examples accordingly.
• Add a lang-utf8 smoke-test assertion to both images’ test-project/test.sh.

Show a summary per file

File	Description
src/javascript-node/.devcontainer/Dockerfile	Sets LANG=C.UTF-8 in the base Node image.
src/typescript-node/.devcontainer/Dockerfile	Sets LANG=C.UTF-8 in the derived TypeScript image as well.
src/javascript-node/test-project/test.sh	Adds a lang-utf8 check asserting LANG defaults to C.UTF-8.
src/typescript-node/test-project/test.sh	Adds a lang-utf8 check asserting LANG defaults to C.UTF-8.
src/javascript-node/manifest.json	Patch version bump 4.0.13 → 4.0.14.
src/typescript-node/manifest.json	Patch version bump 5.0.1 → 5.0.2.
src/javascript-node/README.md	Updates README tag examples to 4.0.14-24.
src/typescript-node/README.md	Updates README tag examples to 5.0.2-24.

Review details

• Files reviewed: 8/8 changed files
• Comments generated: 2
• Review effort level: Low

[Kaniska244]

@copilot Extend this to base-debian and base-ubuntu images if utf8 charset is not set for them already.

[Copilot]

@copilot Extend this to base-debian and base-ubuntu images if utf8 charset is not set for them already.

Done. base-debian and base-ubuntu didn't set a UTF-8 locale, so I added ENV LANG=C.UTF-8 to both Dockerfiles, patch-bumped the manifests (base-debian 2.1.11 → 2.1.12, base-ubuntu 3.0.3 → 3.0.4) with matching README tag examples, and added a lang-utf8 check to each image's test-project/test.sh.