shopping: UI strings all English

Picker dialog, hamburger menu entry, phone page and help section
still had German labels from the original request ("Einkaufsliste",
"keine aktive Liste", etc.). The rest of the app's UI is English,
so align everything here: menu entry is "Shopping list", dialog +
phone page copy translated, help references match. Trigger tags
stay as-is — both #einkauf and #shopping keep working so users with
either convention aren't disrupted.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

public/index.php

@@ -1362,7 +1362,7 @@ if (str_starts_with($route, '/api/')) {
                         <i class="ph ph-list-dashes text-sm"></i>
                     </button>
                     <div id="header-menu" class="hidden absolute right-0 mt-1 min-w-[180px] bg-t-surface border border-t-border shadow-2xl z-50">
-                        <button id="menu-shopping" class="w-full text-left px-3 py-2 text-xs text-t-muted hover:bg-t-raised hover:text-t-accent transition-colors flex items-center gap-2"><i class="ph ph-shopping-cart text-sm"></i><span class="font-pixel text-[10px]">Einkaufsliste</span></button>
+                        <button id="menu-shopping" class="w-full text-left px-3 py-2 text-xs text-t-muted hover:bg-t-raised hover:text-t-accent transition-colors flex items-center gap-2"><i class="ph ph-shopping-cart text-sm"></i><span class="font-pixel text-[10px]">Shopping list</span></button>
                     </div>
                 </div>
                 <button id="calendar-btn" class="flex items-center gap-2 px-2.5 py-1.5 text-xs border border-t-border text-t-muted hover:border-t-accent hover:text-t-accent transition-colors">
@@ -1693,13 +1693,13 @@ if (str_starts_with($route, '/api/')) {
                 <section>
                     <h3 class="font-pixel text-xs text-t-accent mb-3 flex items-center gap-2"><i class="ph ph-shopping-cart text-sm"></i>shopping list (phone sync)</h3>
                     <div class="text-xs leading-relaxed space-y-3 text-t-muted mb-3">
-                        <p>Tag a card with <span class="text-t-accent">#einkauf</span> or <span class="text-t-accent">#shopping</span> to mark it as a shopping-list candidate. Open the header's <i class="ph ph-list-dashes text-xs"></i> menu → <span class="text-t-bright font-pixel">Einkaufsliste</span> to pick which one is the currently <span class="text-t-bright">active</span> list — only one at a time is mirrored to the phone.</p>
+                        <p>Tag a card with <span class="text-t-accent">#einkauf</span> or <span class="text-t-accent">#shopping</span> to mark it as a shopping-list candidate. Open the header's <i class="ph ph-list-dashes text-xs"></i> menu → <span class="text-t-bright font-pixel">Shopping list</span> to pick which one is the currently <span class="text-t-bright">active</span> list — only one at a time is mirrored to the phone.</p>
                         <p>The active card's body is pushed to the relay on every sync tick. On your phone, open <span class="text-t-accent">&lt;your-relay&gt;/shopping</span> and log in with your relay credentials. The page shows only the <span class="text-t-bright">unchecked</span> <code class="text-t-accent">- [ ]</code> items as tappable rows. Tapping an item flips it to <code class="text-t-accent">- [x]</code> on the relay in-place; the next client tick pulls that back and updates the local card.</p>
                         <p>Editing stays in hyprcrd — the phone can only check/uncheck, never change text. That keeps conflict handling trivial (last-writer wins by timestamp).</p>
                     </div>
                     <table class="w-full text-xs">
                         <tr><td class="py-1 text-t-dim w-40 font-pixel"><i class="ph ph-hash text-xs"></i> trigger tags</td><td><span class="text-t-accent">#einkauf</span> or <span class="text-t-accent">#shopping</span> — either counts</td></tr>
-                        <tr><td class="py-1 text-t-dim font-pixel"><i class="ph ph-list-dashes text-xs"></i> pick active</td><td>header menu → Einkaufsliste → radio select → Save</td></tr>
+                        <tr><td class="py-1 text-t-dim font-pixel"><i class="ph ph-list-dashes text-xs"></i> pick active</td><td>header menu → Shopping list → radio select → Save</td></tr>
                         <tr><td class="py-1 text-t-dim font-pixel"><i class="ph ph-device-mobile text-xs"></i> phone URL</td><td><code>https://&lt;relay&gt;/shopping</code> — session-auth, mobile layout</td></tr>
                         <tr><td class="py-1 text-t-dim font-pixel"><i class="ph ph-arrows-clockwise text-xs"></i> sync cadence</td><td>piggybacks on the shared sync tick (see Settings → Relay)</td></tr>
                     </table>