Add real country flags to language selector

- Replace emoji flags with SVG-based country flags
- German flag: Black-Red-Gold (official colors)
- USA flag: Red-White-Blue with stars
- Dynamic flag switching on language change
- Applied to both dashboard and leaderboard
- Database achievements now support English translations
- Extended achievements table with name_en and description_en columns
- Updated API routes to return English translations
- Simplified frontend translation system to use database translations

public/css/dashboard.css

@@ -11,7 +11,7 @@ body {
     background: #0a0a0f;
     color: #ffffff;
     min-height: 100vh;
-    background-image: 
+    background-image:
         radial-gradient(circle at 20% 80%, #1a1a2e 0%, transparent 50%),
         radial-gradient(circle at 80% 20%, #16213e 0%, transparent 50%),
         radial-gradient(circle at 40% 40%, #0f3460 0%, transparent 50%);
@@ -24,6 +24,43 @@ body {
     min-height: 100vh;
 }
 
+/* Language Selector */
+.language-selector {
+    position: fixed;
+    top: 2rem;
+    left: 2rem;
+    z-index: 1000;
+}
+
+.language-selector select {
+    padding: 0.5rem 1rem;
+    background: rgba(15, 23, 42, 0.9);
+    border: 1px solid #334155;
+    border-radius: 0.5rem;
+    color: #ffffff;
+    font-size: 0.9rem;
+    font-weight: 500;
+    cursor: pointer;
+    transition: all 0.2s ease;
+    backdrop-filter: blur(10px);
+    padding-left: 2.5rem;
+    background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="20" height="15" viewBox="0 0 20 15"><rect width="20" height="5" fill="%23000000"/><rect y="5" width="20" height="5" fill="%23DD0000"/><rect y="10" width="20" height="5" fill="%23FFCE00"/></svg>');
+    background-repeat: no-repeat;
+    background-position: 0.5rem center;
+    background-size: 20px 15px;
+}
+
+.language-selector select:hover {
+    border-color: #00d4ff;
+    box-shadow: 0 0 0 2px rgba(0, 212, 255, 0.1);
+}
+
+.language-selector select:focus {
+    outline: none;
+    border-color: #00d4ff;
+    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.2);
+}
+
 .header-section {
     text-align: center;
     margin-bottom: 3rem;
@@ -151,8 +188,13 @@ body {
 }
 
 @keyframes spin {
-    0% { transform: rotate(0deg); }
-    100% { transform: rotate(360deg); }
+    0% {
+        transform: rotate(0deg);
+    }
+
+    100% {
+        transform: rotate(360deg);
+    }
 }
 
 .user-info {
@@ -893,8 +935,10 @@ body {
 /* Touch-friendly improvements for mobile */
 @media (max-width: 768px) {
     .btn {
-        min-height: 44px; /* Apple's recommended minimum touch target */
-        touch-action: manipulation; /* Prevents double-tap zoom */
+        min-height: 44px;
+        /* Apple's recommended minimum touch target */
+        touch-action: manipulation;
+        /* Prevents double-tap zoom */
     }
 
     .card {
@@ -930,7 +974,8 @@ body {
     /* Better spacing for mobile */
     .header-section {
         margin-bottom: 2rem;
-        margin-top: 5rem; /* Account for fixed nav */
+        margin-top: 5rem;
+        /* Account for fixed nav */
     }
 
     /* Improve modal usability on mobile */
@@ -1019,7 +1064,7 @@ body {
         text-align: center;
         gap: 1.5rem;
     }
-    
+
     .footer-links {
         flex-wrap: wrap;
         justify-content: center;
@@ -1292,6 +1337,7 @@ body {
         transform: translateX(100%);
         opacity: 0;
     }
+
     to {
         transform: translateX(0);
         opacity: 1;
@@ -1340,33 +1386,33 @@ body {
     .achievements-header h2 {
         font-size: 2rem;
     }
-    
+
     .achievement-stats {
         flex-direction: column;
         align-items: center;
     }
-    
+
     .achievement-stat {
         width: 100%;
         max-width: 250px;
     }
-    
+
     .category-tabs {
         flex-direction: column;
         align-items: center;
     }
-    
+
     .category-tab {
         width: 100%;
         max-width: 200px;
         text-align: center;
     }
-    
+
     .achievements-grid {
         grid-template-columns: 1fr;
         gap: 1rem;
     }
-    
+
     .achievement-notification {
         top: 1rem;
         right: 1rem;
@@ -1452,11 +1498,11 @@ body {
     border-radius: 50%;
 }
 
-input:checked + .toggle-slider {
+input:checked+.toggle-slider {
     background-color: #00d4ff;
 }
 
-input:checked + .toggle-slider:before {
+input:checked+.toggle-slider:before {
     transform: translateX(26px);
 }
 
@@ -1482,17 +1528,17 @@ input:checked + .toggle-slider:before {
         align-items: flex-start;
         gap: 1rem;
     }
-    
+
     .setting-control {
         margin-left: 0;
         align-self: flex-end;
     }
-    
+
     .settings-actions {
         flex-direction: column;
     }
-    
+
     .settings-actions .btn {
         width: 100%;
     }
-}
+}