translate all analytics to English for template metadata (#6292)

## Summary

Track template metadata in English for analytics regardless of user's
locale to enable consistent statistical analysis.

## Changes

- **What**: Load English [template
index](https://github.com/Comfy-Org/ComfyUI_frontend/tree/main/public/templates)
alongside localized version (cloud builds only)
- **What**: Added `getEnglishMetadata()` method to
`workflowTemplatesStore` that returns English versions of template tags,
category, useCase, models, and license
- **What**: Updated `MixpanelTelemetryProvider` to prefer English
metadata for analytics events, falling back to localized values

## Review Focus

English template fetch only triggers in cloud builds via `isCloud` flag.
Non-cloud builds see no bundle size impact. Method returns null when
English templates unavailable, with fallback to localized data ensuring
analytics continue working in edge cases.

┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-6292-translate-all-analytics-to-English-for-template-metadata-2986d73d365081fdbc21f372aa9bb41e)
by [Unito](https://www.unito.io)

---------

Co-authored-by: github-actions <github-actions@github.com>

src/platform/telemetry/providers/cloud/MixpanelTelemetryProvider.ts

@@ -205,15 +205,20 @@ export class MixpanelTelemetryProvider implements TelemetryProvider {
         const template = templatesStore.getTemplateByName(
           activeWorkflow.filename
         )
+
+        const englishMetadata = templatesStore.getEnglishMetadata(
+          activeWorkflow.filename
+        )
+
         return {
           is_template: true,
           workflow_name: activeWorkflow.filename,
           template_source: template?.sourceModule,
-          template_category: template?.category,
-          template_tags: template?.tags,
-          template_models: template?.models,
-          template_use_case: template?.useCase,
-          template_license: template?.license
+          template_category: englishMetadata?.category ?? template?.category,
+          template_tags: englishMetadata?.tags ?? template?.tags,
+          template_models: englishMetadata?.models ?? template?.models,
+          template_use_case: englishMetadata?.useCase ?? template?.useCase,
+          template_license: englishMetadata?.license ?? template?.license
         }
       }