Add t() translation function to i18n.rs with ~200 key/value pairs
covering navigation, card headers, field labels, buttons, filters,
planting calendar rows, and general UI text in both German and English.
Updated all 11 source files to use t(&lang, "key") instead of
hardcoded English strings: app.rs (sidebar nav), all 7 page files
(species, cultivars, families, suppliers, home, search, sources),
and all 3 component files (planting_calendar, table_controls,
plant_card). Boolean values (Yes/No/Annual) are also translated.
- Language switcher in sidebar (DE/EN buttons, persists to localStorage)
- i18n module with pick_desc/pick_name helpers for language-aware fallback
- All detail/list pages use language context for names and descriptions
- Species/Cultivar types updated with description_de/description_en
- Common Name column added to species/families lists
- Cultivar/species detail pages rewritten with two-column card layout, attribute tables, em-dash placeholders
- Column toggle + per-page selector on all list pages (families, species, cultivars, suppliers)
- Species list: table/card view toggle with family, layer, N-fixer, uses columns
- Cultivar detail: supplier links with SKU/price/product URL, species info section
- Data sources page (/sources) with attribution for all 10 data sources
- Fixed Cultivar/Species structs with #[serde(default)] for API compatibility
- Added table_controls component (reusable column toggle + per-page selector)
- Removed max-width constraint on content area for full-width tables
- Fixed route conflicts: merged {slug}/{id} into single {ref} routes
- Removed PostgreSQL enum types (plant_layer, drought_tolerance, etc.) in favor of TEXT
- Fixed API per_page parameter support across all list endpoints
florian.berthold