start to integrate whisper.

app/i18n/api.ts

@@ -76,5 +76,6 @@ export class CachedTranslator extends Translator {
         const tr2 = await super.translate(text, target);
         const key2 = `${this.source}::${targetKey}::${text}`
         await cache.set(key2, tr2);
+        return tr2;
     }
 }

app/index.tsx

@@ -32,6 +32,10 @@ export default function Home() {
     );
   }
 
+  function onGoBack() {
+    setConversation(undefined);
+  }
+
   return (
     <View style={styles.container}>
       <Stack.Screen
@@ -46,7 +50,7 @@ export default function Home() {
       />
       <Text>Home Screen</Text>
       {conversation ? (
-        <ConversationThread conversation={conversation} />
+        <ConversationThread conversation={conversation} onGoBack={onGoBack} />
       ) : (
         <LanguageSelection onLangSelected={onLangSelected} />
       )}

app/lib/conversation.ts

@@ -14,9 +14,10 @@ export class Message {
     
     constructor (public conversation : Conversation, public speaker : Speaker, public text? : string) {}
 
-    public async translate(translator : Translator, language? : string) {
+    public async translate() {
+        const translator = this.conversation.translator
         if (!this.text) throw new Error("No text")
-        this.translation = await translator.translate(this.text, language);
+        this.translation = await translator.translate(this.text, this.otherLanguage);
     }
 
     get otherSpeaker() {
@@ -34,7 +35,7 @@ export class Conversation extends Array<Message> {
     public onTranslationDone? : (conversation : Conversation) => any;
 
     constructor (
-        private translator : Translator,
+        public translator : Translator,
         public host : Speaker,
         public guest : Speaker,
     ) {
@@ -48,7 +49,7 @@ export class Conversation extends Array<Message> {
     public async translateMessage(i : number) {
         if (!this[i]) throw new Error(`${i} is not a valid message number`);
         console.log(`Translating sentence to %s: %s`, this[i].otherLanguage, this[i].text)
-        await this[i].translate(this.translator, this[i].otherLanguage);
+        await this[i].translate();
     }
 
     get lastMessage() {