[WebUI] Improve the gen_web_gettext script

* Create a 'minified' gettext.js by removing comments from file and simplifying js code.
 * Added creating the file to generate_pot.py, so it is not forgotten about.

generate_pot.py

@@ -16,6 +16,7 @@ import re
 from datetime import datetime
 from subprocess import call
 
+from gen_web_gettext import create_gettext_js
 from version import get_version
 
 # Paths to exclude
@@ -103,4 +104,7 @@ for filepath in to_translate:
     if filepath.endswith(".h"):
         os.remove(filepath)
 
-print "Created %s" % POT_FILEPATH
+# Update web js gettext
+create_gettext_js(WEBUI_JS_DIR)
+
+print "Created %s and updated gettext.js" % POT_FILEPATH