makes upload buttons less shouty

A few of the upload buttons in the admin panel are quite shouty for some reason.

https://meta.discourse.org/t/arbitrary-all-caps-upload-button-on-backups-page/19967
FIX: max 1 day of view time per topic

we were overflowing ints in some conditions and flooding error logs
Make style more consistent with rest of site
Merge pull request #2789 from lukegb/patch-1

makes upload buttons less shouty
Merge pull request #2790 from mfeckie/admin-group-styling

Make style more consistent with rest of site
Add css selector for 'star' th element

Allows custom css rules to hide this column.
SECURITY: Limit passwords to 200 characters

Prevents layer 8 attack.
SECURITY: Malformed URL could crash V8
FIX: Scroll position when hitting back button to category filter
Migrate more helpers to ES6 format.
Better resolver support for underscored templates. Eventually we'll
migrate to dashed only.
Use dashed names for all templates when using `{{render}}` for future
Ember compatibility
stripping port information from Discourse.BaseUrl

Port information if presented in Discourse.BaseUrl may break user avatar URL in the template generation.

https://github.com/discourse/discourse/edit/master/app/assets/javascripts/discourse/models/user.js
avatarTemplate()

In the future there should be a way to reference baseUrl with or without port information
Removed stupid `{{log}}` message that I left in because I'm stupid.
Merge pull request #2791 from lidlanca/patch-1

stripping port information from Discourse.BaseUrl
Rename elder to leader
move pre/kbd to base css, remove obscure CSS
shorten keyboard shortcut help copy
Merge pull request #2793 from techAPJ/patch-2

Rename elder to leader
UX: rename "invisible" to "unlisted"