48116 frontend [ templates ] localize empty checklist validation errors

[aicarma-artyom-maslov]

Note

Low Risk
Localized error mapping only in getErrorMessage and locale files; no auth or data-path changes.

Overview
Template save/API validation errors for checklists now resolve to localized message keys instead of raw English backend strings.

getErrorMessage gains mapValidationMessage: blank-value errors (value: this field may not be blank.) map to validation.checklist-item-empty when details.api_name starts with citem-, otherwise validation.field-empty. The backend message Checklist items not exists or invalid. maps to validation.checklist-items-invalid. ICustomError.details now includes optional api_name for that branching.

New copy was added in en_US and ru_RU for those keys, with unit tests covering the three mapping cases.

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Note

Localize empty checklist validation errors in frontend templates

• Adds two new localization keys (validation.checklist-item-empty and validation.checklist-items-invalid) to the en_US.ts and ru_RU.ts locale files.
• Extends getErrorMessage in getErrorMessage.ts with a mapValidationMessage helper that detects blank-value errors and returns validation.checklist-item-empty when details.api_name starts with citem-, or validation.field-empty otherwise.
• Maps the backend message 'Checklist items not exists or invalid.' to validation.checklist-items-invalid in the error mapper.
• Adds unit tests covering all three new mappings in getErrorMessage.test.ts.

^{Macroscope summarized 911d198.}