Translate images inside replies and captions alongside images

@@ -215,14 +215,45 @@ bot.onText(/^\/(t|translate)($| ((.|\n)+))/, (msg, match) => {
   // Whether a message has been given after '/t' command
   const msgExists = received_msg != undefined;
 
-  // Translate the reply's target message
   if (isReply) {
+    // Translate the reply's target message
     const replyMsg = msg.reply_to_message.text;
     translate(user, replyMsg).then(function (result) {
       bot.sendMessage(chatId, result);
     }).catch(function (error) {
       console.log(error);
     });
+
+    // If the reply contains image, translate it as well
+    const photoExists = msg.reply_to_message.photo != undefined;
+    if (photoExists) {
+      // Choose largest image possible
+      const photo = msg.reply_to_message.photo[msg.reply_to_message.photo.length - 1];
+      const photoId = photo.file_id;
+      const caption = msg.reply_to_message.caption;
+
+      // Detect text from given image
+      detectText(photoId).then(function (text) {
+        // Translate the result
+        translate(user, text).then(function (result) {
+          // Send recognized text to user
+          bot.sendMessage(chatId, result);
+        });
+      }).catch(function (error) {
+        // Text detection failed
+        console.log('Text detection error: ', error);
+      });
+
+      // Translate caption if exists
+      const captionExists = caption != undefined;
+      if (captionExists) {
+        translate(user, caption).then(function (result) {
+          bot.sendMessage(chatId, result);
+        }).catch(function (error) {
+          console.log(error);
+        });
+      }
+    }
   }
 
   // Translate the message after '/t' if exists
@@ -243,6 +274,7 @@ bot.on('photo', (msg) => {
   const chatId = msg.chat.id;
   const photo = msg.photo[msg.photo.length - 1]; // Choose largest image possible
   const photoId = photo.file_id;
+  const caption = msg.caption;
 
   // Detect text from given image
   detectText(photoId).then(function (text) {
@@ -255,6 +287,16 @@ bot.on('photo', (msg) => {
     // Text detection failed
     console.log('Text detection error: ', error);
   });
+
+  // Translate caption if exists
+  const captionExists = caption != undefined;
+  if (captionExists) {
+    translate(user, caption).then(function (result) {
+      bot.sendMessage(chatId, result);
+    }).catch(function (error) {
+      console.log(error);
+    });
+  }
 });
 
 // /l(anguage)