fix(i18n): wrap the remaining user-facing strings

[mardausdennis]

Follow-up to #721. That sweep covered most of the editor, so after it merged I walked the rest of the app to see what still renders in English regardless of the user's language.

What this covers

• Dashboard and page lifecycle — route tree loading and pagination, template gallery import toasts, template group page counts
• Editor shell — the small-screen notice, the fragment breadcrumb, the settings loading state, the URL Variables section, the viewer summary
• Command palette — search placeholders and both empty states
• Settings — domains, redirects and users were untouched by earlier sweeps and were almost entirely English
• Controls and modals — block search and replace, split-mode input, state variants, shadow layers, the design token manager
• Stores, utils and data — component save and sync, font weight labels, image optimisation, domain toasts
• Desk and backend — the Builder Settings component filter dialog, the Open Builder command, and the FC API error

Translator-facing changes

Every interpolated message became a stable placeholder source. Counted messages now select a singular or plural string instead of rendering token(s), and the CSV import confirmation no longer joins translated fragments into another translated sentence. German and other inflected languages cannot express those forms.

Deliberately not included

• The permission messages passed to has_page_write / has_page_read. A decorator argument is evaluated at import time, so _() there would resolve the translation before a user session exists. Translating inside the decorator would work, but it changes the decorator's contract, so it seemed better to raise it than to slip it in here.
• The visibility-condition description, which carries markup.
• Gradient and page preset names. They read as proper nouns, and the whole preset object is emitted to callers, so translating name would change what consumers receive.
• The AI surfaces, since feat: Bob - AI Assistant for Builder 🤖 #671 is rewriting them.

Lookup keys and sentinels stay raw: Mixed, UNGROUPED_LABEL, the breakpoint device values, the numeric font weights, and the command palette group keys.

Overlap with open PRs

Some of these files are also touched by open drafts: #733, #671 and #702. Everything here is a one-line wrap, so conflicts should be mechanical, but flagging it since #715 and #721 collided the same way. Happy to rebase whenever it suits.

Checks

Vue templates and TypeScript compile clean locally for all 37 changed frontend files, and domain.py parses. POT extraction and the suites run in CI.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable defects identified.

Translation calls preserve existing behavior, interpolation contracts, and stable non-display values.

_{Reviews (1): Last reviewed commit: "fix(i18n): wrap the remaining user-facin..." | Re-trigger Greptile}

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 66.04%. Comparing base (38d68fd) to head (1837a54).

Files with missing lines	Patch %	Lines
builder/domain.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #746      +/-   ##
===========================================
- Coverage    66.05%   66.04%   -0.02%     
===========================================
  Files           37       37              
  Lines         4982     4983       +1     
===========================================
  Hits          3291     3291              
- Misses        1691     1692       +1     

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[github-actions]

🎉 This PR is included in version 1.33.0 🎉

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