cleanup usage of labels.txt a bit

scripts/common.php

@@ -93,32 +93,12 @@ function debug_log($message) {
 
 function get_com_en_name($sci_name) {
   if (!isset($_labels_flickr)) {
-    $_labels_flickr = file(get_home() . "/BirdNET-Pi/model/labels_flickr.txt");
-  }
-  $engname = null;
-  foreach ($_labels_flickr as $label) {
-    if (trim(explode("_", $label)[0]) === $sci_name) {
-      $engname = trim(explode("_", $label)[1]);
-      break;
-    }
+    $_labels_flickr = json_decode(file_get_contents(get_home() . "/BirdNET-Pi/model/l18n/labels_en.json"), true);
   }
+  $engname = $_labels_flickr[$sci_name];
   return $engname;
 }
 
-function get_sci_name($com_name) {
-  if (!isset($_labels)) {
-    $_labels = file(get_home() . "/BirdNET-Pi/model/labels.txt");
-  }
-  $sciname = null;
-  foreach ($_labels as $label) {
-    if (trim(explode("_", $label)[1]) === $com_name) {
-      $sciname = trim(explode("_", $label)[0]);
-      break;
-    }
-  }
-  return $sciname;
-}
-
 function get_label($record, $sort_by, $date=null) {
   $name = $record["Com_Name"];
   if ($sort_by == "confidence") {