Docs accuracy and i18n completion from the maintainer review

[dkastl]

Final PR from the maintainer review: documentation accuracy and internationalization. Two commits, one per concern.

Docs and helper scripts

• The three tutorial examples described the pre-v3.0 form: a Broker URL field on the template (connections are admin-managed since Introduce broker connections as reusable configuration #67) and an Insert project boundary link that no longer exists (the Area radio replaced it). Rewritten to the current UI.
• Both helper shell scripts added the tenant headers exactly when the variables were not set (inverted -z tests), so a tenant-scoped broker never received them. broker_scripts.md also pointed at a scripts/ directory that does not exist and told readers to replace a broker URL "with your actual Redmine API key".
• init.rb now enforces the redmine_gtt dependency the README always claimed; installing without it broke at runtime anyway, just later and less clearly. README gains a Development section (how to run the Ruby and Vitest suites).
• Smaller accuracy fixes: the on-demand entity endpoint documents its instance-identifier precondition; release_verification.md no longer claims the callback URL is always built from the request host; a broken sentence, the "Ngix" typo, an http link, a filler paragraph.

i18n

• Full en/ja/de key parity. 18-19 keys were missing from ja/de entirely, all user-visible: the wizard steps and help texts, the boundary-notes feature including the journal note text (Japanese users received English notes in their issues), and the member/custom-field hints.
• The Japanese UI is actually Japanese now. A large ja block still carried English values: form labels, publish/copy messages, the threshold hint. Translated.
• The auth-token hint described a PROXY button removed in Move "connect via proxy" and subscription throttling out of global settings onto connections #95; it now explains what really decides where the token goes (the connection's authentication mode). "Sent from user" becomes "Create issues as" in all three languages, docs included.
• The copy/publish JS responses used hard-coded English strings; they use the locale now (the command_copied key existed in all three languages, referenced by nothing). The publish/unpublish list icons get the hover hints whose keys also existed unused.
• Dead keys removed from all three locales, each verified by grep before deletion: the four pre-Redesign the subscription template form with progressive disclosure #66 form section headings, the insert-project-boundary trio, the unused settings-tab key, and the whole gtt_fiware.* namespace of the read API removed in Remove the bespoke NGSI read API #60 (whose status/tracker messages had been swapped in every locale, fittingly for keys nothing read).
• The list partial stops piping plain values through textilizable, which wiki-rendered user data into <p>-wrapped cells for no benefit.

Verification

YAML validity and full leaf-key parity checked programmatically for all three locales (no missing, no extra keys). Full suite: 355 runs, 1215 assertions, 0 failures; 64 JS tests pass.

Not included, deliberately: moving the two inline <script> blocks into assets, form-prologue helper extraction, and the label for= accessibility pass. Those are real but carry regression risk disproportionate to this PR; follow-up issue to come.

[Copilot]

Pull request overview

This PR finalizes maintainer-review feedback by aligning documentation and helper scripts with the current UI/behavior, and completing internationalization so user-facing strings are consistent across en/ja/de (including wiring previously-unused locale keys into the UI).

Changes:

• Update docs/tutorial examples and verification notes to match current connection-based UI and host-name/callback behavior.
• Fix tenant-header handling in helper scripts and correct broker script documentation paths/wording.
• Enforce the redmine_gtt hard dependency at plugin load time and localize remaining UI/JS strings (copy/publish hints, placeholders), removing unused locale keys.

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Adds development test instructions; fixes Redmine plugin docs link to HTTPS.
init.rb	Enforces redmine_gtt as a required plugin dependency.
doc/subscription_template.md	Updates UI terminology (“Create issues as”) to match current form labels.
doc/scripts/register_all_subscriptions.sh	Fixes tenant header inclusion conditions (-n instead of inverted -z).
doc/scripts/delete_all_subscriptions.sh	Fixes tenant header inclusion conditions (-n instead of inverted -z).
doc/release_verification.md	Corrects callback URL derivation guidance (host name setting vs request host fallback).
doc/issue_emission.md	Documents instance-identifier precondition for the on-demand entity endpoint.
doc/index.md	Fixes wording/typo (“Nginx”) and replaces filler text with issue-tracker guidance.
doc/examples/temperature_sensor.md	Updates example to use admin-managed broker connections and new label text.
doc/examples/location_sensor.md	Updates example to use “Area” instead of removed boundary-insert link; new label text.
doc/examples/camera_sensor.md	Updates example to use broker connections and new label text.
doc/broker_scripts.md	Fixes script paths (doc/scripts) and corrects broker URL / API key wording.
config/locales/ja.yml	Completes/cleans up Japanese translations; adds missing keys and removes unused ones.
config/locales/en.yml	Removes unused keys; improves/extends strings used by UI/JS placeholders and hints.
config/locales/de.yml	Adds missing German keys and updates hints/labels to current UI behavior.
app/views/subscription_templates/publish.js.erb	Uses localized error message when broker response lacks Location header.
app/views/subscription_templates/copy.js.erb	Localizes copy-to-clipboard success/failure/unavailable notifications.
app/views/subscription_templates/_subscription_template.html.erb	Stops textilizable rendering for plain values; adds publish/unpublish hover titles.
app/views/subscription_templates/_form_filters.html.erb	Localizes watched-attributes placeholder text.
app/views/subscription_templates/_attachment_row.html.erb	Localizes attachment URL/filename placeholders.
app/controllers/subscription_templates_controller.rb	Updates comment to match renamed UI label (“Create issues as”).

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.