Add path for server's special version of PyOpenSSL to PYTHONPATH.
Fix link details URL to have a locale.
Disable submit button on customize screens until option chosen.
Show native language names in generator and sort alphabetically.
Add old datapoint aggregation to nightly update.
Show 100 entries on leaderboard and lazy-load avatars.
Hide banners that are not visible from the banner list and customize.
Only display categories that have visible banners.
Do not disable default options in image generator.

Otherwise, you get a weird bug where hovering over an enabled option and
clicking twice outside the select selects the option you hovered over
but doesn't change the displayed option.
Remove duplicate categories from category display.
Add newsletter form plus a few other tweaks

* Updated milestone style
* Added news sidebar copy
* Added blank avatar
* Optimized images
* Added noscript notice
Add info about Stylus to the setup docs.
Use an empty alt attribute in image banners.
Fix DeprecationWarnings from non-aware datetimes.
Make customization dropdown labels consistent.
Use &times; to separate dimensions for image size.
Update milestone strings to latest copy and mark them for l10n.
Remove resolved TODOs.
Make links in banner code absolute so they work on other sites.
Replace strings.py with template+view and remove <span> from categories.

Template + view will allow localizers to edit the strings via pontoon.