Add Spanish translations for categories, sectors, and workshop titles

[maebeale]

What is the goal of this PR and why is this important?

• Workshop tags (categories, sectors) and titles currently only display in English, even when viewing the Spanish tab
• This adds name_spanish to categories, sectors, and category_types, and title_spanish to workshops
• When a workshop is viewed in Spanish mode, tags and title now display their Spanish translations (falling back to English when blank)

How did you approach the change?

• Added name_spanish column to categories, sectors, and category_types tables
• Added title_spanish column to workshops table
• Updated admin forms and show pages to expose the new Spanish fields
• Updated tagging label partials to accept a spanish flag and conditionally display the Spanish name
• Moved tag rendering from above the English/Spanish tabs into each tab's content div, so switching tabs naturally shows the correct language
• Spanish title renders as an <h2> inside the Spanish tab content (only when present)
• Updated decorators with title_spanish / detail_spanish methods that fall back to English
• Updated has_spanish_fields? to also check title_spanish
• All strong params updated across controllers

UI Testing Checklist

• Workshop show page: verify tags appear inside the English tab
• Workshop show page: switch to Español tab and verify Spanish tags and title display
• Workshop show page: verify fallback to English when no Spanish translations exist
• Category admin: verify Name (Spanish) field on new/edit forms and show page
• Sector admin: verify Name (Spanish) field on new/edit forms and show page
• Category type admin: verify Name (Spanish) field on new/edit forms and show page
• Workshop edit: verify Title (Spanish) field in the Spanish Translations section

Anything else to add?

• Consistent with existing _spanish suffix column pattern used by workshop content fields
• No data migration needed — all Spanish fields are nullable and fall back gracefully

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