Translate learn page and add audio speed control

server/api/learn/state.put.ts

@@ -64,6 +64,11 @@ function sanitizeConfig(input: Partial<LearnConfig> | undefined): LearnConfig |
     config.radioLevel = Math.min(5, Math.max(1, level))
   }
 
+  if (typeof input.audioSpeed === 'number' && Number.isFinite(input.audioSpeed)) {
+    const rounded = Math.round(input.audioSpeed * 10) / 10
+    config.audioSpeed = Math.min(1.3, Math.max(0.7, rounded))
+  }
+
   if (typeof input.voice === 'string') {
     config.voice = input.voice.slice(0, 120)
   }

server/models/LearnProfile.ts

@@ -20,6 +20,7 @@ const learnProfileSchema = new mongoose.Schema<LearnProfileDocument>(
       radioLevel: { type: Number, default: 4, min: 1, max: 5 },
       voice: { type: String, default: '', trim: true },
       audioChallenge: { type: Boolean, default: false },
+      audioSpeed: { type: Number, default: 1, min: 0.5, max: 2 },
     },
   },
   {