Migration Python2 towards Python3 (#4232)

The modified code stays compatible with Python2.

data/po/extract_strings_from_XML.py

@@ -87,9 +87,9 @@ for file in filenames:
     try:
         doc = xml.dom.minidom.parse(file)
     except Exception as ex:
-        print "============================================"
-        print "/!\\ Expat doesn't like ", file, "! Error=", type(ex), " (", ex.args, ")"
-        print "============================================"
+        print("============================================")
+        print("/!\\ Expat doesn't like ", file, "! Error=", type(ex), " (", ex.args, ")")
+        print("============================================")
 
     traverse(file, doc, isChallenge, isGP, isKart, isTrack, isAchievements)
     

data/po/update_po_authors.py

@@ -25,14 +25,14 @@ import sys
 
 if __name__ == "__main__":
     if len(sys.argv) < 2:
-        print "Usage: getpo_authors.py PATH_TO_PO_FILE"
+        print("Usage: getpo_authors.py PATH_TO_PO_FILE")
         sys.exit(-1)
 
     for filename in sys.argv[1:]:
         print("Processing file %s" % filename)
         f = open(filename, "r")
         if not f:
-            print "Can not find", filename
+            print("Can not find", filename)
             exit
         lines = f.readlines()