Unify header used in POT-files

Removing header generated by pygettext so it doesn't change all the time

po/main/SABnzbd.pot

@@ -12,9 +12,6 @@ msgstr ""
 "MIME-Version: 1.0\n"
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
-"POT-Creation-Date: 2020-06-27 23:06+0200\n"
-"Generated-By: pygettext.py 1.5\n"
-
 
 #: SABnzbd.py [Error message]
 msgid "Failed to start web-interface"

tools/extract_pot.py

@@ -140,26 +140,22 @@ os.system(cmd)
 print("Finished creating POT file")
 
 print("Post-process POT file")
-src = open("%s/%s.pot.tmp" % (PO_DIR, DOMAIN), "r")
-dst = open("%s/%s.pot" % (PO_DIR, DOMAIN), "w")
-dst.write(HEADER.replace("__TYPE__", "MAIN"))
-header = True
-
-for line in src:
+with open("%s/%s.pot.tmp" % (PO_DIR, DOMAIN), "r") as source_pot, open("%s/%s.pot" % (PO_DIR, DOMAIN), "w") as dest_pot:
+    dest_pot.write(HEADER.replace("__TYPE__", "MAIN"))
+    header = True
+    for line in source_pot:
         if line.startswith("#:"):
             line = line.replace("\\", "/")
             if header:
-            dst.write("\n\n")
+                dest_pot.write("\n")
             header = False
         if header:
-        if not ('"POT-Creation-Date:' in line or '"Generated-By:' in line):
+            # Skip header generated by pygettext
             continue
         elif line.startswith("#:"):
             line = get_context(line)
-    dst.write(line)
+        dest_pot.write(line)
 
-src.close()
-dst.close()
 os.remove("%s/%s.pot.tmp" % (PO_DIR, DOMAIN))
 print("Finished post-process POT file")