Use ISO 639-2 **three** letter code for corpus sigle

Change-Id: Ia508328142f2f800851e7ecb129fda4db3371cfc
diff --git a/eng2tei.py b/eng2tei.py
index be20615..2cb73b4 100644
--- a/eng2tei.py
+++ b/eng2tei.py
@@ -69,7 +69,7 @@
         fileDesc = ET.SubElement(teiHeader, "fileDesc")
         titleStmt = ET.SubElement(fileDesc, "titleStmt")
         textSigle = ET.SubElement(titleStmt, "textSigle")
-        textSigle.text = "EN/" + f"{j:03}" + "." + f"{i:05}"
+        textSigle.text = "ENG/" + f"{j:03}" + "." + f"{i:05}"
         sourceDesc = ET.SubElement(fileDesc, "sourceDesc")
         analytic = ET.SubElement(sourceDesc, "analytic")
         title = ET.SubElement(titleStmt, "title")