exif: suppress Perl language warning

Signed-off-by: Varun Patil <radialapps@gmail.com>

lib/Exif.php

@@ -414,6 +414,8 @@ class Exif
 
     private static function getExiftool(): array
     {
+        putenv('LANG=C'); // set perl lang to suppress warning
+
         return BinExt::getExiftool();
     }