getLanguageInfo returns Locale instead of String

so that java can automatically translate with Locale.getDisplayLanguage(), instead of always having English name of the language

extractor/src/test/java/org/schabi/newpipe/extractor/services/peertube/PeertubeStreamExtractorDefaultTest.java

@@ -11,6 +11,7 @@ import java.io.IOException;
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 import java.util.Calendar;
+import java.util.Locale;
 
 import org.junit.BeforeClass;
 import org.junit.Ignore;
@@ -154,4 +155,9 @@ public class PeertubeStreamExtractorDefaultTest {
         supportInfoExtractor.fetchPage();
         assertEquals("https://utip.io/chatsceptique", supportInfoExtractor.getSupportInfo());
     }
+
+    @Test
+    public void testGetLanguageInformation() throws ParsingException {
+        assertEquals(new Locale("en"), extractor.getLanguageInfo());
+    }
 }