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- Error line highlighting in JinjaEditor (red background on error line)
- Backend returns error_line from TemplateSyntaxError
- Localized syntax error messages with line number
- Renamed {{ }} button to "Variables" (localized)
- Localized all template variable descriptions (EN/RU)
- Added t() fallback parameter for graceful degradation
- Page transition animation (fade) to prevent content stacking
- Added syntaxError/line i18n keys
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>