Issue 828 — Residual i18n: project-scoped build duplicate/hint messages still said "test plan"

Sub-task of enhancement #503 — "builds should be scoped to the Test Project, not to a single Test Plan". The core build.class.php move to project scope was implemented and verified in commit 29a10a8f1 (feat(builds): scope build manager to test project ..., Refs #828). This fix addresses a residual UI wording bug: the modernized Builds screen still told the user that build names must be unique "within the test plan", even though uniqueness is now enforced per test project.

The problem (root cause)

After #828 the build manager operates project-wide:

• lib/functions/build.class.php — checkNameExistence() filters on testproject_id (:676-677), and create()/createFromObject() use it (:144).
• lib/functions/testplan.class.php — check_build_name_existence() resolves the plan to its project (:2478-2505) and get_builds() lists all builds in the plan's project (:2291).

Consequently a build name can be rejected even though no build of that name exists on the current test plan — it exists on a different plan of the same project. Two user-facing strings in the modernized Builds screen (gui/templates/plans/buildsView.html) were not re-worded for this:

• inline hint: i18n key bv.nameHint — "must be unique within the test plan" (buildsView.html:106)
• duplicate toast: i18n key bv.msg.duplicateName — "A build with that name already exists in this test plan" (buildsView.html:243,254-255)

Both describe the wrong (plan) scope and mislead the user should a name be rejected because of a build on another plan.

Note: milestone messages (ms.* keys, planMilestones.html) were intentionally not changed — milestones remain plan-scoped.

The fix (HOW)

Chosen method: wording-only i18n update. The machine error code (warning_duplicate_build, api/builds/index.php:268,470) and the backend exception text in build.class.php were already correct from 29a10a8f1; only the front-end localized strings were stale.

1. Changed the two keys from "test plan" to "test project" in all 10 locale bundles under gui/templates/i18n/:
   • bv.msg.duplicateName → "…already exists in this test project"
   • bv.nameHint → "must be unique within the test project" (and equivalent translations in de, es, fr, it, ja, pt, ro, ru, zh).
2. Updated the HTML fallback text at buildsView.html:106 for consistency (data-i18n overwrites it at runtime anyway).
3. Left ms.* (milestone) keys untouched — milestones stay plan-scoped.

Why this method (alternatives rejected)

• Changing the server message — rejected: api/builds/index.php returns the machine code warning_duplicate_build which the screen maps to a localized key; the server text is internal, not user-facing.
• Rewording the milestone strings too — rejected: not in scope, milestones are genuinely plan-scoped.

Screenshots

Before (misleading "test plan" toast):

After (correct "test project" toast + hint):

Files changed

• gui/templates/i18n/{de,en,es,fr,it,ja,pt,ro,ru,zh}.json — line 163 bv.msg.duplicateName, line 168 bv.nameHint: "test plan" → "test project".
• gui/templates/plans/buildsView.html:106 — HTML fallback for bv.nameHint.
• docs/screenshots/issue-828-*.png — before/after screenshots.

Commit: 1cb4ad533 (fix(builds): re-word project-scoped duplicate/hint i18n from 'test plan' to 'test project' (Refs #828)).

Verification

Ran against the running app (admin/admin, project M828 id 2100, plans P-A 2101 / P-B 2102, builds v2.0/v2.1 in project 2100):

• Create-Build modal hint reads "must be unique within the test project".
• Attempting create of v2.0 on plan P-B (name exists on the OTHER plan P-A) → rejected with toast "…already exists in this test project: v2.0".
• Unique name unique-build-828 → created then deleted cleanly.
• builds table unchanged (no phantom rows); events clean (only INFO-level audit rows, no Error/Warning); browser console only the expected 409 Conflict from the intentional duplicate attempt.
• python3 -m json.tool valid for all 10 bundles.
• Code-review subagent: minimal, correct, safe.

Regression matrix

• (a) cross-plan duplicate rejected + wording = "test project" → PASS.
• (b) unique-name creation works → PASS.
• (c) milestone ms.* messages unchanged ("test plan") → unchanged.
• (d) all 10 bundles valid JSON → PASS.
• (e) Event Viewer / events — no new Error/Warning → PASS.

Test suite recorded in tmp/TLU_Test_Cases.md — Regression — Issue #828 (TC-828.1–828.8), 8/8 PASS.