Add Transifex info to contribution guidelines
Add no-browser flag
Fix translation in upgrading/restarting dialogs
Never remove currently valid languages when updating translations
Merge branch 'master' into browser-flag
Add tojrobinson
Merge commit 'bc2bb22'

* commit 'bc2bb22':
  Add no-browser flag
Correctly handle file updates in read only directories (fixes #470)
Woops, broke the build
Translation update, add Danish & Dutch
Localize Close button in standard modals (fixes #481)
Upgrade debugging, fix upgrade on ARM (fixes #482)
Woops, broke the build
Merge branch 'master' of https://github.com/syncthing/syncthing
Fix root being left world writable
Add Windows upgrade support
Add explicit GC calls after expensive db ops (ref #468)
Merge pull request #485 from tojrobinson/world-writable-root

World writable root
Merge pull request #486 from AudriusButkevicius/windows

Add Windows upgrade support
Merge remote-tracking branch 'upstream/master'