The lint:xliff command validates the XML syntax of the XLIFF translation files, but it's common to make other mistakes like the following:

 <!-- messages.fa.xlf -->
 <?xml version="1.0" encoding="utf-8"?>
 <xliff xmlns="urn:oasis:names:tc:xliff:document:1.2" version="1.2">
-    <file source-language="en" target-language="en" datatype="plaintext" original="file.ext">
+    <file source-language="en" target-language="fa" datatype="plaintext" original="file.ext">

In my experience it's pretty common to forget update the target-language value and keep the original one (en in this case). So, could we improve lint:xliff to detect and report this error too? Question to translation and XLIFF experts:

• Should we do this?
• Is this really an error? The app works great even if target-language is wrong? Does Symfony ignore this? Is it on purpose or a bug too?
• Are there other common XLIFF errors that we could fix too?

Thanks!