* 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.
With xgettext set to python it will parse the comments in javascript files, so
single apostrophes or quotes are flagged as 'warning: untermined string'.
This change just rewrites js comments to not use apostrophes.
* Added N802 to flake8 ignore as certain inherited funcs cannot be changed
to lowercase and this unresolved warning hides other errors/warnings.
* Include new header