Merge pull request #391 from solstag/master

update pt-br translation
snakebite: bring back some of the legacy XML discovery interfaces, update as required.
more efficient public feed fetching
removed default maximagesize - it can be set in the admin pages.
start of legacy probe utility
clarify location - issue #392
Update and fix dark scheme

Updated the dark scheme as far as possible. Some items do not have a string, so they can't be themed. A dark derived theme would probably better.
No empty strings
Merge pull request #393 from jeroenpraat/patch-1

Update and fix dark scheme
some work on jot, remove some deprecated js and some random style fixes
Update documentation on connecting to channels and on documentation.