Add Vietnamese language into selectable lang in UI (updated)

[thanhtantran]

Add Vietnamese language into selectable lang in UI (updated)

[greptile-apps]

Greptile Summary

This PR adds a full Vietnamese (vi) locale to static/i18n.js, covering ~1,300 translation keys across all UI areas (offline messages, voice mode, session management, onboarding, settings, MCP, cron jobs, kanban, and more). The previously reported issues (duplicate session keys with differing translations and full-width CJK punctuation in error-prefix strings) have been addressed in this updated version.

• Adds the complete vi locale object with translations for every key present in the English fallback locale.
• One duplicate untitled key remains (lines 18849 and 19052); both carry identical values so there is no visible runtime difference, but the redundant entry should be removed.
• No CHANGELOG.md entry was included for this user-visible language addition, as required by AGENTS.md.

Confidence Score: 5/5

Safe to merge — the change is purely additive, touching only the translation file with no logic modifications.

The PR adds a new locale object without modifying any existing keys or runtime logic. The one duplicate key found carries an identical value in both occurrences, so there is no observable translation regression. The two blocking issues from the previous review round (differing duplicate session-management translations and full-width CJK punctuation in error strings) have been corrected.

static/i18n.js — the duplicate untitled key at lines 18849 and 19052 should be cleaned up before the next edit to that key.

Important Files Changed

Filename	Overview
static/i18n.js	Adds the Vietnamese (vi) locale with ~1,300 keys. One duplicate untitled key (lines 18849 and 19052) exists with identical values; the previous duplicate-key issues (differing translations, full-width punctuation) from the prior review round have been resolved.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A[User selects language in Settings] --> B{Chosen locale}
    B -->|vi - new in this PR| C[loadLocale vi]
    B -->|en or other| D[loadLocale lang]
    C --> E[LOCALES.vi - 1300 keys]
    D --> F[Existing locale object]
    E --> G[_locale set to vi]
    F --> G
    G --> H[t key returns Vietnamese string]
    H --> I[UI renders in Vietnamese]

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%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    A[User selects language in Settings] --> B{Chosen locale}
    B -->|vi - new in this PR| C[loadLocale vi]
    B -->|en or other| D[loadLocale lang]
    C --> E[LOCALES.vi - 1300 keys]
    D --> F[Existing locale object]
    E --> G[_locale set to vi]
    F --> G
    G --> H[t key returns Vietnamese string]
    H --> I[UI renders in Vietnamese]

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_{Reviews (4): Last reviewed commit: "Merge branch 'nesquena:master' into mast..." | Re-trigger Greptile}

[greptile-apps]

Duplicate session keys silently discard "cuộc trò chuyện" translations

This entire block (lines 18330–18362) defines keys that are redefined again starting at line 19168 under the comment // Session management and settings keys (en fallback — pending translation). In a JavaScript object literal, duplicate keys cause the later value to silently overwrite the earlier one, so every translation here that uses "cuộc trò chuyện" — including session_pin, session_archive, session_restore, session_delete, session_duplicate, session_move_project_desc_has/none, and session_stop_response_desc — will never be seen at runtime. The block at line 19168 wins and uses "phiên" throughout. Either remove the first block or the second, keeping only one consistent set.

[greptile-apps]

Full-width colon ： and period 。 in error-prefix and status strings

Several strings in this second session-management block use the Unicode full-width colon ： (U+FF1A) and full-width period 。 (U+3002) instead of their ASCII equivalents. Affected keys include session_archive_failed (line 19173), session_worktree_remove_failed (19190), session_worktree_remove_status_failed (19191), session_duplicate_failed (19200), and session_pin_failed (19209). The English pattern for these keys ends with ': ' (ASCII colon + space) because the string is concatenated directly with an error message at runtime — e.g., t('session_archive_failed') + err. Using 'Lưu trữ thất bại：' produces Lưu trữ thất bại：<error text> with no space and an unexpected CJK character. Similarly, session_worktree_removed and several session_worktree_remove_* strings end with 。 rather than ., producing inconsistent sentence-final punctuation.

[greptile-apps]

Inconsistent indentation in the vi locale block

The rest of the file (including the English locale at line 7) uses 4-space indentation consistently throughout. The vi block mixes hard tabs, 2-space, 3-space, and 4-space indentation across different sections. Some sections (e.g., offline_title at line 17870) use hard tabs, while others (e.g., the pdf_loading group) use 4 spaces, and keys around slash_skill_badge and cmd_background use 2 or 3 spaces. This is a style-only issue and won't affect runtime, but it makes the block harder to maintain and review.

Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!

[nesquena-hermes]

Thanks for the update @thanhtantran — this revision (now in #4241) is closer: down from 50 missing keys to 27. To finish it, please add Vietnamese translations for the remaining keys that exist in en but not vi (they'll otherwise fall back to English):

discard, clear, create, remove, settings_heading_title, settings_heading_subtitle,
settings_section_conversation_title, settings_section_appearance_title, settings_section_appearance_meta,
settings_section_preferences_title, settings_section_preferences_meta, settings_section_system_title,
settings_section_system_meta, settings_check_now, settings_checking, settings_up_to_date,
settings_updates_available, settings_updates_disabled, settings_update_check_failed,
settings_label_workspace_panel_open, settings_desc_workspace_panel_open,
settings_label_workspace_todos_tab, settings_desc_workspace_todos_tab,
settings_label_session_jump_buttons, settings_desc_session_jump_buttons,
settings_label_terminal_auto_expand, settings_desc_terminal_auto_expand

(These are the searchable-settings section + a few generic action labels. Diffing the vi key set against en will surface any remaining drift.)

Two housekeeping notes:

• You have two open PRs for this (Add Vietnamese into selectable language in UI #4238 and Add Vietnamese language into selectable lang in UI (updated) #4241). I've closed the older Add Vietnamese into selectable language in UI #4238 as superseded — please keep all the work on Add Vietnamese language into selectable lang in UI (updated) #4241.
• Adding a new selectable UI language is a product decision, and the translation quality itself needs a Vietnamese-speaker / maintainer (@nesquena) sign-off — flagging that as the gate beyond the structural completeness above.

Once the 27 keys are filled in, this is in good shape structurally. Leaving #4241 open for your update.

[thanhtantran]

Hi @nesquena-hermes,

I have updated the translation, please check

[nesquena-hermes]

Thanks for the update @thanhtantran. Pulling the branch and diffing the vi block (static/i18n.js:18690-19988) against the current en block (static/i18n.js:7-1491) on this PR's HEAD:

• Good news on structure: your dedup commit 9f2e706d ("deduplicate vi locale, fix full-width chars, normalize indentation") did its job — vi is now a clean strict subset of en with 0 extraneous keys (no typo'd or orphaned keys). That's exactly the shape we want.
• The gap got bigger, not smaller — and it's not your fault. vi now has 1258 keys vs 1432 in en, so 174 keys are missing (up from the 27 I flagged earlier). The reason is that master landed several large new English string sets after my last review, and those merged into your branch:
  • e47f685b advanced per-model options + auxiliary routing (feat: add advanced model options #3097) → the ~75 settings_aux_advanced_* / settings_aux_task_* keys
  • b01f3d59 model cost/health table on Insights (Feature request: Model health comparison table with replacement guide #691) → insights_model_health_*
  • ecf637c6 approval controls → gateway runs API (feat(#4203): bridge gateway runs API for approval controls #4229) → approval_*
  • 70b7cf86 toolset selector profile defaults (Allow selecting active profile toolsets instead of manually entering each tool #3100) → session_toolsets_*
  • 922efdf2 conversation outline panel (Feature Request: Conversation Outline / Jump-to-Question Sidebar Panel (对话提纲) #2124) → outline_*

So you were translating against a moving target. One more sync pass against current en should close it.

Missing keys by area (174 total)

75  settings_*        32  session_*       15  checkpoint_*
13  composer_*         9  excalidraw_*     5  yolo_*
 5  csv_*              4  media_*          4  insights_*
 3  outline_*          3  approval_*       + clear, create,
                                             remove, discard,
                                             cmd_yolo, model_show_all_models

Two gotchas when you add these

A handful of en values are not plain strings — copy the value shape exactly or the locale will break at runtime:

• Placeholder style (static/i18n.js:526,531):

session_selected_count: '{0} selected',
session_batch_archive_confirm: 'Archive {0} conversations?',

• Arrow-function style (static/i18n.js:1474,1478):

checkpoint_restore_confirm_message: (ckpt) => `Restore workspace to checkpoint "${ckpt}"? ...`,
checkpoint_diff_files_changed: (n) => `${n} file${n === 1 ? '' : 's'} changed`,

For the function ones, keep the (arg) => \...${arg}...`` signature and just translate the surrounding text.

How to self-check before pushing

Diff the vi key set against en again after you fill these in — when the two key sets match (0 missing, 0 extra) it's structurally complete.

Same two gates as before still apply: adding a new selectable UI language is a product decision, and the Vietnamese wording itself needs a Vietnamese-speaker / maintainer (@nesquena) sign-off. Leaving #4241 open for the next sync pass.

[nesquena-hermes]

Update — vi is structurally clean ✅ but still missing 201 keys (the gap grew as master added features)

@thanhtantran — re-ran the parity check on the current head against today's en block. Same story as my last pass, just refreshed numbers:

• ✅ Structure is correct — vi is a clean strict subset of en (0 extraneous/typo'd keys), good indentation, full-width chars fixed. The shape matches the other locales exactly, which is what we need.
• ⚠️ 201 keys are still untranslated (vi has 1272, en has 1467) — these would silently fall back to English in the Vietnamese UI. The count went up from my earlier 174 because master keeps landing new English keys (checkpoints, composer mobile/queue/steer controls, approval flow, CSV export, etc.) while this branch sits — you're chasing a moving target, which isn't your fault.

This is the one thing blocking merge: a new selectable language should be reasonably complete, not 14% English-fallback. The CI locale-parity tests (test_quota_chip…, test_endless_scroll_i18n…, test_verdigris/zeus_skin…, +15 more) fail for exactly this reason — they assert every locale has the keys a feature introduced.

To get it over the line

1. Rebase onto current master first (you're ~51 behind — translate against the current en, not a stale snapshot, so you don't immediately fall behind again).
2. Add Vietnamese translations for the 201 missing keys. I've generated the exact list — the missing keys are everything in en (static/i18n.js) not present in your vi block; the big clusters are: checkpoint_* (~12), composer_* (mobile/queue/steer/send/stop/interrupt), approval_*, csv_*, cmd_yolo/commands, and assorted settings/preferences labels. Happy to paste the full 201-key list here if useful.
3. Re-push — the locale-parity CI tests will go green once vi reaches key parity, and I'll run the full gate + ship it. Vietnamese is a welcome addition; it just needs to be complete.

No rush — take the time to do the translations well (machine-translating 201 UI strings tends to read poorly; native/careful translation is worth more than speed).